Mac·ro·pod n.  Zool. Any one of a group of maioid crabs remarkable for the length of their legs; -- called also spider crab.

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 Sea spi·der Zool. (a) Any maioid crab; a spider crab. See Maioid, and Spider crab, under Spider. (b) Any pycnogonid.

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 Spi·der n.
 1. Zool. Any one of numerous species of arachnids comprising the order Araneina. Spiders have the mandibles converted into poison fangs, or falcers. The abdomen is large and not segmented, with two or three pairs of spinnerets near the end, by means of which they spin threads of silk to form cocoons, or nests, to protect their eggs and young. Many species spin also complex webs to entrap the insects upon which they prey. The eyes are usually eight in number (rarely six), and are situated on the back of the cephalothorax. See Illust. under Araneina.
 Note: ☞ Spiders are divided into two principal groups: the Dipneumona, having two lungs: and the Tetrapneumona, having four lungs. See Mygale. The former group includes several tribes; as, the jumping spiders (see Saltigradae), the wolf spiders, or Citigradae (see under Wolf), the crab spiders, or Laterigradae (see under Crab), the garden, or geometric, spiders, or Orbitellae (see under Geometrical, and Garden), and others. See Bird spider, under Bird, Grass spider, under Grass, House spider, under House, Silk spider, under Silk.
 2. Zool. Any one of various other arachnids resembling the true spiders, especially certain mites, as the red spider (see under Red).
 3. An iron pan with a long handle, used as a kitchen utensil in frying food. Originally, it had long legs, and was used over coals on the hearth.
 4. A trevet to support pans or pots over a fire.
 5. Mach. A skeleton, or frame, having radiating arms or members, often connected by crosspieces; as, a casting forming the hub and spokes to which the rim of a fly wheel or large gear is bolted; the body of a piston head; a frame for strengthening a core or mold for a casting, etc.
 Spider ant. Zool. Same as Solitary ant, under Solitary.
 Spider crab Zool., any one of numerous species of maioid crabs having a more or less triangular body and ten long legs. Some of the species grow to great size, as the great Japanese spider crab (Macrocheira Kempferi), measuring sometimes more than fifteen feet across the legs when they are extended.
 Spider fly Zool., any one of numerous species of parasitic dipterous insects of the family Hippoboscidae. They are mostly destitute of wings, and live among the feathers of birds and the hair of bats. Called also bird tick, and bat tick.
 Spider hunter Zool., any one of several species of East Indian sunbirds of the genus Arachnothera.
 Spider lines, filaments of a spider's web crossing the field of vision in optical instruments; -- used for determining the exact position of objects and making delicate measurements. Fine wires, silk fibers, or lines on glass similarly placed, are called spider lines.
 Spider mite. Zool. (a) Any one of several species of parasitic mites of the genus Argas and allied genera. See Argas. (b) Any one of numerous small mites injurious to plants.
 Spider monkey Zool., any one of numerous species of South American monkeys of the genus Ateles, having very long legs and a long prehensile tail.
 Spider orchis Bot., a European orchidaceous plant (Ophrys aranifera), having flowers which resemble spiders.
 Spider shell Zool., any shell of the genus Pteroceras. See Pteroceras.

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 Tri·an·gu·la·res n. pl.  Zool. The triangular, or maioid, crabs. See Illust. under Maioid, and Illust. of Spider crab, under Spider.

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 Crab n.
 1. Zool. One of the brachyuran Crustacea. They are mostly marine, and usually have a broad, short body, covered with a strong shell or carapace. The abdomen is small and curled up beneath the body.
 Note: ☞ The name is applied to all the Brachyura, and to certain Anomura, as the hermit crabs.  Formerly, it was sometimes applied to Crustacea in general. Many species are edible, the blue crab of the Atlantic coast being one of the most esteemed. The large European edible crab is Cancer padurus. Soft-shelled crabs are blue crabs that have recently cast their shells. See Cancer; also, Box crab, Fiddler crab, Hermit crab, Spider crab, etc., under Box, Fiddler. etc.
 2. The zodiacal constellation Cancer.
 3.  Bot. A crab apple; -- so named from its harsh taste.
 When roasted crabs hiss in the bowl,
 Then nightly sings the staring owl.   --Shak.
 4. A cudgel made of the wood of the crab tree; a crabstick. [Obs.]
 5. Mech. (a) A movable winch or windlass with powerful gearing, used with derricks, etc. (b) A form of windlass, or geared capstan, for hauling ships into dock, etc. (c) A machine used in ropewalks to stretch the yarn. (d) A claw for anchoring a portable machine.
 Calling crab. Zool. See Fiddler., n., 2.
 Crab apple, a small, sour apple, of several kinds; also, the tree which bears it; as, the European crab apple (Pyrus Malus var. sylvestris); the Siberian crab apple (Pyrus baccata); and the American (Pyrus coronaria).
 Crab grass. Bot. (a) A grass (Digitaria sanguinalis syn. Panicum sanguinalis); -- called also finger grass. (b) A grass of the genus Eleusine (Eleusine Indica); -- called also dog's-tail grass, wire grass, etc.
 Crab louse Zool., a species of louse (Phthirius pubis), sometimes infesting the human body.
 Crab plover Zool., an Asiatic plover (Dromas ardeola).
 Crab's eyes, or Crab's stones, masses of calcareous matter found, at certain seasons of the year, on either side of the stomach of the European crawfishes, and formerly used in medicine for absorbent and antacid purposes; the gastroliths.
 Crab spider Zool., one of a group of spiders (Laterigradæ); -- called because they can run backwards or sideways like a crab.
 Crab tree, the tree that bears crab applies.
 Crab wood, a light cabinet wood obtained in Guiana, which takes a high polish. --McElrath.
 To catch a crab Naut., a phrase used of a rower: (a) when he fails to raise his oar clear of the water; (b) when he misses the water altogether in making a stroke.


 spider crab
      n : any of numerous crabs with very long legs and small
          triangular bodies