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A mineral of a dark brown color, generally with a fibrous, massive structure. It is a fluophosphate of iron and manganese.

Trivial name (Nat. Hist.), the specific name.(Chem.) The common name, not describing the structure and from which the structure cannot be deduced; -- contrasted with systematic name.

A pulley, or a structure resembling a pulley; as, the trochlea, or pulleylike end, of the humerus, which articulates with the ulna; or the trochlea, or fibrous ring, in the upper part of the orbit, through which the superior oblique, or trochlear, muscle of the eye passes.

Any structure shaped like a tub: as, a certain old form of pulpit; a short, broad boat, etc., -- often used jocosely or opprobriously. All being took up and busied, some in pulpits and some in tubs, in the grand work of preaching and holding forth. South.

Of, pertaining to, or designating, an extensive family of languages of simple structure and low grade (called also Altaic, Ural-Altaic, and Scythian), spoken in the northern parts of Europe and Asia and Central Asia; of pertaining to, or designating, the people who speak these languages.

A little tower, frequently a merely ornamental structure at one of the angles of a larger structure.

A narrow superstructure running from stem to stern on the upper deck of a steam cargo vessel having a rounded gunwale and sides curved inward convexly.

A general form or structure common to a number of individuals; hence, the ideal representation of a species, genus, or other group, combining the essential characteristics; an animal or plant possessing or exemplifying the essential characteristics of a species, genus, or other group. Also, a group or division of anima…

Unorganized; without definite shape or structure; as, an unformed, or unorganized, ferment. Unformed stars (Astron.), stars not grouped into any constellation; informed stars. See Sporades.

molecules of all complete compounds are units, whose parts are bound together in definite structure, with mutual and reciprocal influence on each other, and are not mere aggregations of more or less complex groups; -- distinguished from the dualistic theory.

To undo the mechanism of; to unmake; as, to unmechanize a structure. [Obs.] Sterne.

Not organized; being without organic structure; specifically (Biol.), not having the different tissues and organs characteristic of living organisms, nor the power of growth and development; as, the unorganized ferments. See the Note under Ferment, n., 1.

Destitute of a bony structure.

Being without symmetry of chemical structure or relation; as, an unsymmetrical carbon atom. Unsymmetrical carbon atom (Chem.), one which is united at once to four different atoms or radicals. This condition usually occasions physical isomerism, with the attendant action on polarized light.

ecially one of the posterior ones, which are often larger than the rest, and different in structure, and are used chiefly in locomotion. See Illust. of Crustacea, and Stomapoda.

A microscopic cell in the structure of an egg, animal, or plant.

tions or changes in their environment, thus possibly giving rise to ultimate variation of structure or function.

one of those forms in which a species may occur, which differ in minor characteristics of structure, color, purity of composition, etc.

Consisting of, or containing, vessels as an essential part of a structure; full of vessels; specifically (Bot.), pertaining to, or containing, special ducts, or tubes, for the circulation of sap.

An arched structure of masonry, forming a ceiling or canopy. The long-drawn aisle and fretted vault. Gray.