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Possessed of but a single nucleus; as, a uninucleated cell.

Having but one pole or process; -- applied to those ganglionic nerve cells which have but one radiating process; -- opposed to multipolar. Unipolar induction (Elec.), induction, as in a conducting circuit, by only one pole of a magnet. -- Unipolar stimulation (Physiol.), the simulation sometimes produced when one elec…

Having but one septum, or partition; -- said of two-celled fruits, such as the silicles of cruciferous plants.

A little sac or vesicle, as the air cell of fucus, or seaweed.

Full of vacuoles, or small air cavities; as, vacuolated cells.

A small air cell, or globular space, in the interior of organic cells, either containing air, or a pellucid watery liquid, or some special chemical secretions of the cell protoplasm. Contractile vacuole. (Zoöl.) See under Contractile, and see Illusts. of Infusoria, and Lobosa. -- Food vacuole. (Zoöl.) See under Food,…

s of marine green algæ, in which the whole frond consists of a single oval or cylindrical cell, often an inch in length.

ll of which are vascular, in distinction from the cryptogams, which to a large extent are cellular only. Vascular plants (Bot.), plants composed in part of vascular tissue, as all flowering plants and the higher cryptogamous plants, or those of the class Pteridophyta. Cf. Cellular plants, Cellular. -- Vascular system…

One of the substances of which vegetable tissue is composed, differing from cellulose in its solubility in certain media.

he development and formation of blood vessels and blood corpuscles; as, the vasoformative cells.

subterranean room, use for storing articles, for a prison, for interment, or the like; a cell; a cellar. "Charnel vaults." Milton. The silent vaults of death. Sandys. To banish rats that haunt our vault. Swift.

Vaulted work; also, a vaulted place; an arched cellar. [Obs.] Shak.

ants without true flowers, and reproduced by minute spores of various kinds, or by simple cell division. { 1. Acrogens. -- Plants usually with distinct stems and leaves, existing in two alternate conditions, one of which is nonsexual and sporophoric, the other sexual and oöphoric. Divided into Vascular Acrogens, or Pt…

th fresh air, and remove impure air from; to air; as, to ventilate a room; to ventilate a cellar; to ventilate a mine.

son speaking, but from some other source, as from the opposite side of the room, from the cellar, etc.

A bladderlike vessel; a membranous cavity; a cyst; a cell. Specifically: --(a) (Bot.)

Of or pertaining to vesicles; esp., of or pertaining to the air vesicles, or air cells, of the lungs; as, vesicular breathing, or normal breathing, in which the air enters freely the air vesicles of the lungs.

of marine Bryozoa belonging to Vesicularia and allied genera. They have delicate tubular cells attached in clusters to slender flexible stems.

A continuous tube formed from superposed large cylindrical or prismatic cells (tracheæ), which have lost their intervening partitions, and are usually marked with dots, pits, rings, or spirals by internal deposition of secondary membranes; a duct. Acoustic vessels. See under Acoustic. -- Weaker vessel, a woman; -- now…

Producing yolk, or vitelline substance; -- applied to certain cells (also called nutritive, or yolk, cells) formed in the ovaries of many insects, and supposed to supply nutriment to the developing ova.