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A white crystalline substance regarded as a hydrate of oil of turpentine.

a hyacinthine odor, obtained by the action of acids on terpin, and regarded as a related hydrate.

The chitinous cup which protects the hydranths of certain hydroids.

A division of hydroids comprising those which have the hydranths in thecæ and the gonophores in capsules. The campanularians and sertularians are examples. Called also Thecata. See Illust. under Hydroidea.

yestuff having a greenish metallic luster. It is produced artificially, by the chemical dehydration of thionine, as a brown amorphous powder.

liquid, C6H5.SH, of an offensive odor, and analogous to phenol; -- called also phenyl sulphydrate.

A carbohydrate isomeric with dextrin, obtained from quitch grass (Agropyrum, formerly Triticum, repens) as a white amorphous substance.

An alkaloid, C8H13N, obtained by the chemical dehydration of tropine, as an oily liquid having a coninelike odor.

A genus of hydroids having large, naked, flowerlike hydranths at the summits of long, slender, usually simple, stems. The gonophores are small, and form clusters at the bases of the outer tentacles.

ected directly with the heart.-- Vena contracta. Etym: [L., literally, contracted vein.] (Hydraulics) The contracted portion of a liquid jet at and near the orifice from which it issues. -- Vena portæ; pl. VenÆ portæ. Etym: [L., literally, vein of the entrance.] (Anat.) The portal vein of the liver. See under Portal.…

itrate with calcium carbonate (in the form of lime, whiting, chalk, etc.) They consist of hydrated copper carbonates analogous to the minerals azurite and malachite. Verditer blue, a pale greenish blue color, like that of the pigment verditer.

Hydraulic cement.

Hydraulic lime.

Any of numerous species of aquatic mites belonging to Hydrachna and allied genera of the family Hydrachnidæ, usually having the legs fringed and adapted for swimming. They are often red or red and black in color, and while young are parasites of fresh-water insects and mussels. Called also water tick, and water spider.…

An hydraulic ram.

An hydraulic apparatus, or a system of works or fixtures, by which a supply of water is furnished for useful or ornamental purposes, including dams, sluices, pumps, aqueducts, distributing pipes, fountains, etc.; -- used chiefly in the plural.

One of three alkaloids found in the root of the yellow puccoon (Hydrastis Canadensis). It is a yellow crystalline substance, and resembles berberine.

One of the small green granulelike bodies found in the interior of certain stentors, hydras, and other invertebrates.