Mack·er·el n.  Zool. Any species of the genus Scomber of the family Scombridae, and of several related genera.  They are finely formed and very active oceanic fishes.  Most of them are highly prized for food.
 Note: ☞ The common mackerel (Scomber scombrus), which inhabits both sides of the North Atlantic, is one of the most important food fishes.  It is mottled with green and blue.  The Spanish mackerel (Scomberomorus maculatus), of the American coast, is covered with bright yellow circular spots.
 Bull mackerel, Chub mackerel. Zool. See under Chub.
 Frigate mackerel. See under Frigate.
 Horse mackerel . See under Horse.
 Mackerel bird Zool., the wryneck; -- so called because it arrives in England at the time when mackerel are in season.
 Mackerel cock Zool., the Manx shearwater; -- so called because it precedes the appearance of the mackerel on the east coast of Ireland.
 Mackerel guide. Zool. See Garfish (a).
 Mackerel gull Zool. any one of several species of gull which feed upon or follow mackerel, as the kittiwake.
 Mackerel midge Zool., a very small oceanic gadoid fish of the North Atlantic.  It is about an inch and a half long and has four barbels on the upper jaw.  It is now considered the young of the genus Onos, or Motella.
 Mackerel plow, an instrument for creasing the sides of lean mackerel to improve their appearance. --Knight.
 Mackerel shark Zool., the porbeagle.
 Mackerel sky, or Mackerel-back sky, a sky flecked with small white clouds; a cirro-cumulus. See Cloud.
 Mackerel sky and mare's-tails
 Make tall ships carry low sails.   --Old Rhyme.

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 Plow, Plough  n.
 1. A well-known implement, drawn by horses, mules, oxen, or other power, for turning up the soil to prepare it for bearing crops; also used to furrow or break up the soil for other purposes; as, the subsoil plow; the draining plow.
    Where fern succeeds ungrateful to the plow.   --Dryden.
 2. Fig.: Agriculture; husbandry.
 3. A carucate of land; a plowland. [Obs.] [Eng.]
    Johan, mine eldest son, shall have plowes five.   --Tale of Gamelyn.
 4. A joiner's plane for making grooves; a grooving plane.
 5. Bookbinding An implement for trimming or shaving off the edges of books.
 6. Astron. Same as Charles's Wain.
 Ice plow, a plow used for cutting ice on rivers, ponds, etc., into cakes suitable for storing. [U. S.]
 Mackerel plow. See under Mackerel.
 Plow alms, a penny formerly paid by every plowland to the church. --Cowell.
 Plow beam, that part of the frame of a plow to which the draught is applied. See Beam, n., 9.
 Plow Monday, the Monday after Twelth Day, or the end of Christmas holidays.
 Plow staff. (a) A kind of long-handled spade or paddle for cleaning the plowshare; a paddle staff. (b) A plow handle.
 Snow plow, a structure, usually Λ-shaped, for removing snow from sidewalks, railroads, etc., -- drawn or driven by a horse or a locomotive.