Spring, n.
 1. A leap; a bound; a jump.
    The prisoner, with a spring, from prison broke.   --Dryden.
 2. A flying back; the resilience of a body recovering its former state by its elasticity; as, the spring of a bow.
 3. Elastic power or force.
    Heavens! what a spring was in his arm!   --Dryden.
 4. An elastic body of any kind, as steel, India rubber, tough wood, or compressed air, used for various mechanical purposes, as receiving and imparting power, diminishing concussion, regulating motion, measuring weight or other force.
 Note: ☞ The principal varieties of springs used in mechanisms are the spiral spring (Fig. a), the coil spring (Fig. b), the elliptic spring (Fig. c), the half-elliptic spring (Fig. d), the volute spring, the India-rubber spring, the atmospheric spring, etc.
 5. Any source of supply; especially, the source from which a stream proceeds; an issue of water from the earth; a natural fountain. “All my springs are in thee.” --Ps. lxxxvii. 7. “A secret spring of spiritual joy.” --Bentley. “The sacred spring whence right and honor streams.”
 6. Any active power; that by which action, or motion, is produced or propagated; cause; origin; motive.
 Our author shuns by vulgar springs to move
 The hero's glory, or the virgin's love.   --Pope.
 7. That which springs, or is originated, from a source; as: (a) A race; lineage. [Obs.] --Chapman. (b) A youth; a springal. [Obs.] --Spenser. (c) A shoot; a plant; a young tree; also, a grove of trees; woodland. [Obs.] --Spenser. Milton.
 8. That which causes one to spring; specifically, a lively tune. [Obs.]
 9. The season of the year when plants begin to vegetate and grow; the vernal season, usually comprehending the months of March, April, and May, in the middle latitudes north of the equator. “The green lap of the new-come spring.”
 Note: ☞ Spring of the astronomical year begins with the vernal equinox, about March 21st, and ends with the summer solstice, about June 21st.
 10. The time of growth and progress; early portion; first stage; as, the spring of life. “The spring of the day.”
 O how this spring of love resembleth
 The uncertain glory of an April day.   --Shak.
 11. Naut. (a) A crack or fissure in a mast or yard, running obliquely or transversely. (b) A line led from a vessel's quarter to her cable so that by tightening or slacking it she can be made to lie in any desired position; a line led diagonally from the bow or stern of a vessel to some point upon the wharf to which she is moored.
 Air spring, Boiling spring, etc. See under Air, Boiling, etc.
 Spring back Bookbinding, a back with a curved piece of thin sheet iron or of stiff pasteboard fastened to the inside, the effect of which is to make the leaves of a book thus bound (as a ledger or other account or blank book) spring up and lie flat.
 Spring balance, a contrivance for measuring weight or force by the elasticity of a spiral spring of steel.
 Spring beam, a beam that supports the side of a paddle box. See Paddle beam, under Paddle, n.
 Spring beauty. (a) Bot. Any plant of the genus Claytonia, delicate herbs with somewhat fleshy leaves and pretty blossoms, appearing in springtime. (b) Zool. A small, elegant American butterfly (Erora laeta) which appears in spring. The hind wings of the male are brown, bordered with deep blue; those of the female are mostly blue.
 Spring bed, a mattress, under bed, or bed bottom, in which springs, as of metal, are employed to give the required elasticity.
 Spring beetle Zool., a snapping beetle; an elater.
 Spring box, the box or barrel in a watch, or other piece of mechanism, in which the spring is contained.
 Spring fly Zool., a caddice fly; -- so called because it appears in the spring.
 Spring grass Bot., vernal grass. See under Vernal.
 Spring gun, a firearm discharged by a spring, when this is trodden upon or is otherwise moved.
 Spring hook Locomotive Engines, one of the hooks which fix the driving-wheel spring to the frame.
 Spring latch, a latch that fastens with a spring.
 Spring lock, a lock that fastens with a spring.
 Spring mattress, a spring bed.
 Spring of an arch Arch. See Springing line of an arch, under Springing.
 Spring of pork, the lower part of a fore quarter, which is divided from the neck, and has the leg and foot without the shoulder. [Obs.] --Nares.
    Sir, pray hand the spring of pork to me.   --Gayton.

 Spring pin Locomotive Engines, an iron rod fitted between the springs and the axle boxes, to sustain and regulate the pressure on the axles.
 Spring rye, a kind of rye sown in the spring; -- in distinction from winter rye, sown in autumn.
 Spring stay Naut., a preventer stay, to assist the regular one. --R. H. Dana, Jr.
 Spring tide, the tide which happens at, or soon after, the new and the full moon, and which rises higher than common tides. See Tide.
 Spring wagon, a wagon in which springs are interposed between the body and the axles to form elastic supports.
 Spring wheat, any kind of wheat sown in the spring; -- in distinction from winter wheat, which is sown in autumn.

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 Tide n.
 1. Time; period; season. [Obsoles.] “This lusty summer's tide.”
    And rest their weary limbs a tide.   --Spenser.
 Which, at the appointed tide,
 Each one did make his bride.   --Spenser.
    At the tide of Christ his birth.   --Fuller.
 2. The alternate rising and falling of the waters of the ocean, and of bays, rivers, etc., connected therewith. The tide ebbs and flows twice in each lunar day, or the space of a little more than twenty-four hours. It is occasioned by the attraction of the sun and moon (the influence of the latter being three times that of the former), acting unequally on the waters in different parts of the earth, thus disturbing their equilibrium. A high tide upon one side of the earth is accompanied by a high tide upon the opposite side. Hence, when the sun and moon are in conjunction or opposition, as at new moon and full moon, their action is such as to produce a greater than the usual tide, called the spring tide, as represented in the cut. When the moon is in the first or third quarter, the sun's attraction in part counteracts the effect of the moon's attraction, thus producing under the moon a smaller tide than usual, called the neap tide.
 Note: ☞ The flow or rising of the water is called flood tide, and the reflux, ebb tide.
 3. A stream; current; flood; as, a tide of blood. “Let in the tide of knaves once more; my cook and I'll provide.”
 4. Tendency or direction of causes, influences, or events; course; current.
 There is a tide in the affairs of men,
 Which, taken at the flood, leads on to fortune.   --Shak.
 5. Violent confluence. [Obs.]
 6. Mining The period of twelve hours.
 Atmospheric tides, tidal movements of the atmosphere similar to those of the ocean, and produced in the same manner by the attractive forces of the sun and moon.
 Inferior tide. See under Inferior, a.
 To work double tides. See under Work, v. t.
 Tide day, the interval between the occurrences of two consecutive maxima of the resultant wave at the same place. Its length varies as the components of sun and moon waves approach to, or recede from, one another. A retardation from this cause is called the lagging of the tide, while the acceleration of the recurrence of high water is termed the priming of the tide. See Lag of the tide, under 2d Lag.
 Tide dial, a dial to exhibit the state of the tides at any time.
 Tide gate. (a) An opening through which water may flow freely when the tide sets in one direction, but which closes automatically and prevents the water from flowing in the other direction. (b) Naut. A place where the tide runs with great velocity, as through a gate.
 Tide gauge, a gauge for showing the height of the tide; especially, a contrivance for registering the state of the tide continuously at every instant of time. --Brande & C.
 Tide lock, a lock situated between an inclosed basin, or a canal, and the tide water of a harbor or river, when they are on different levels, so that craft can pass either way at all times of the tide; -- called also guard lock.
 Tide mill. a A mill operated by the tidal currents. (b) A mill for clearing lands from tide water.
 Tide rip, a body of water made rough by the conflict of opposing tides or currents.
 Tide table, a table giving the time of the rise and fall of the tide at any place.
 Tide water, water affected by the flow of the tide; hence, broadly, the seaboard.
 Tide wave, or  Tidal wave, the swell of water as the tide moves. That of the ocean is called primitive; that of bays or channels derivative.  See also tidal wave in the vocabulary. --Whewell.
 Tide wheel, a water wheel so constructed as to be moved by the ebb or flow of the tide.