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A genus of transparent, free-swimming marine worms having lateral and caudal fins, and capable of swimming rapidly. It is the type of the class Chætognatha.

sinthii Etym: [NL.] (Old Chem.), an impure potassium carbonate obtained from the ashes of wormwood (Artemisia Absinthium). -- Sal acetosell\'91 Etym: [NL.] (Old Chem.), salt of sorrel. -- Sal alembroth. (Old Chem.) See Alembroth. -- Sal ammoniac (Chem.), ammonium chloride, NH4Cl, a white crystalline volatile substan…

A white crystalline substance having a bitter taste, extracted from the buds of levant wormseed and used as an anthelmintic. It occassions a peculiar temporary color blindness, causing objects to appear as if seen through a yellow glass.

ryo produced directly from the egg in a metagenetic series, especially the larva of a tapeworm or other parasitic worm. See Illust. of Echinococcus.

ar structure found in Potsdam sandstone, and believed to be the fossil burrow of a marine worm.

othed wheel by the action of its threads between the teeth of the wheel; -- called also a worm. -- Lag screw. See under Lag. -- Micrometer screw, a screw with fine threads, used for the measurement of very small spaces. -- Right and left screw, a screw having threads upon the opposite ends which wind in opposite dir…

A part or surface on which another part or surface rests; as, a valve seat. Seat worm (Zoöl.), the pinworm.

consist of the leaves, peduncles, and unexpanded flowers of various species of Artemisia; wormseed.

A silk gland, as in the silkworms.

The raising of silkworms.

A dry, scaly eruption on the skin; especially, a ringworm.

reous tube, which is usually irregularly contorted, but is sometimes spirally coiled. The worm has a wreath of plumelike and often bright-colored gills around its head, and usually an operculum to close the aperture of its tube when it retracts.

rmed in embryonic mollusks. (b) A glandular organ which secretes the eggshells of various worms, crustacea, mollusks, etc. -- Shell gun, a cannon suitable for throwing shells. -- Shell ibis (Zoöl.), the openbill of India. -- Shell jacket, an undress military jacket. -- Shell lime, lime made by burning the shells of…

hread produced by various species of caterpillars in forming the cocoons within which the worm is inclosed during the pupa state, especially that produced by the larvæ of Bombyx mori.

(Zoöl.) (a) Any nudibranch mollusk. (b) A holothurian. -- Slug caterpillar. Same as Slugworm.

or with cord, the small rope lying in the spaces between the strands of the large one; to worm.

A shrubby species of wormwood (Artemisia Abrotanum) having aromatic foliage. It is sometimes used in making beer.

liquid, which hardens on coming into contact with the air; -- said of the spider, the silkworm, etc.

ing gland (Zoöl.), one of the glands which form the material for spinning the silk of silkworms and other larvæ. -- Spinning house, formerly a common name for a house of correction in England, the women confined therein being employed in spinning. -- Spinning jenny (Mach.), an engine or machine for spinning wool or c…

ries of larval forms in the agamic reproduction of various trematodes and other parasitic worms. The sporocyst generally develops from an egg, but in its turn produces other larvæ by internal budding, or by the subdivision of a part or all of its contents into a number of minute germs. See Redia.