Search the Dictionary

Of or pertaining to organit structure; as, a structural element or cell; the structural peculiarities of an animal or a plant. Structural formula. (Chem.) See Rational formula, under Formula. empirical formula.

l and vegetable organisms; as, organic structure, or the structure of animals and plants; cellular structure.

Without a definite structure, or arrangement of parts; without organization; devoid of cells; homogeneous; as, a structureless membrane.

A cellar beneath another story wholly or partly underground; usually, a cellar under a cellar.

A material found in the cell walls of cork. It is a modification of lignin.

Conversion of the cell walls into cork tissue by development of suberin; -- commonly taking place in exposed tissues, as when a callus forms over a wound. Suberized cell walls are impervious to water.

Tissue in which the cell or partition walls are wholly wanting and the cell bodies fused together, so that the tissue consists of a continuous mass of protoplasm in which nuclei are imbedded, as in ordinary striped muscle.

in certain sponges. It consists of several filaments, each of which arises from a single cell.

Any small cell, or like place, in which some holy or precious things was deposited or kept. Specifically: --

aining to a tegument or tegmentum; as, the tegmental layer of the epiblast; the tegmental cells of the taste buds.

itive or negative. The transmitter includes a camera obscura and a row of minute selenium cells. The receiver includes an oscillograph, ralay, equilibrator, and an induction coil the sparks from which perforate a paper with tiny holes that form the image.

Having tissued composed of cells.

The thick-celled winter or resting spore of the rusts (order Uredinales), produced in late summer. See Illust. of Uredospore.

A cellular layer derived from the nucleus of an ovule and surrounding the embryo sac. Cf. Quintine.

ess plants, such as fungi, algæ, and lichens, that consist of a thallus only, composed of cellular tissue, or of a congeries of cells, or even of separate cells, and never show a distinction into root, stem, and leaf.

lgæ, fungi, and lichens. The simpler forms, as many blue-green algæ, yeasts, etc., are unicellular and reproduce vegetatively or by means of asexual spores; in the higher forms the plant body is a thallus, which may be filamentous or may consist of plates of cells; it is commonly undifferentiated into stem, leaves, an…

A solid mass of cellular tissue, consisting of one or more layers, usually in the form of a flat stratum or expansion, but sometimes erect or pendulous, and elongated and branching, and forming the substance of the thallogens.

A sheath; a case; as, the theca, or cell, of an anther; the theca, or spore case, of a fungus; the theca of the spinal cord.

iders; gossamer. -- Thread and thrum, the good and bad together. [Obs.] Shak. -- Thread cell (Zoöl.), a lasso cell. See under Lasso. -- Thread herring (Zoöl.), the gizzard shad. See under Gizzard. -- Thread lace, lace made of linen thread. -- Thread needle, a game in which children stand in a row, joining hands, a…

A tumor produced by the escape of blood into the subcutaneous cellular tissue.