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The substance from which attraction spheres develop in mitotic cell division, and of which they consist.

r restraining from further motion, etc.; stoppage; hindrance; restraint; as, an arrest of development. As the arrest of the air showeth. Bacon.

origin and formation of all things. This philosophy was first broached by Leucippus, was developed by Democritus, and afterward improved by Epicurus, and hence is sometimes denominated the Epicurean philosophy. -- Atomic theory, or the Doctrine of definite proportions (Chem.), teaches that chemical combinations take…

A kind of chætopod larva in which no circles of cilia are developed.

Affected with atrophy, as a tissue or organ; arrested in development at a very early stage; rudimentary.

Poisoning caused by a virus that originates and develops in the organism itself.

A system of natural drainage developed by the constituent streams through headwater erosion.

Developed from an independent center of ossification. Owen. Autogenous soldering, the junction by fusion of the joining edges of metals without the intervention of solder.

Not advanced in civilization; undeveloped; as, the country or region is in a backward state.

A bar of cartilage at the base of the embryonic fins of some fishes. It develops into the metapterygium. -- Ba*sip`ter*yg"i*al (, a.

To develop bells or corollas; to take the form of a bell; to blossom; as, hops bell.

Life development generally.

which is not living; the study of living tissue. It has to do with the origin, structure, development, function, and distribution of animals and plants.

The larva of certain starfishes as developed in the free- swimming stage.

The germinal membrane in an ovum, from which the embryo is developed.

That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.

A blooming period or stage of development; something lovely that gives rich promise. In the blossom of my youth. Massinger.

Swollen; inflated; distended; puffed up, as cattle when gorged with green food which develops gas.

The language of the Czechs (the ancient inhabitants of Bohemia), the richest and most developed of the dialects of the Slavic family.

m of vertebrate animals. It is simply the anterior termination of the spinal cord, and is developed from three embryonic vesicles, whose cavities are connected with the central canal of the cord; the cavities of the vesicles become the central cavities, or ventricles, and the walls thicken unequally and become the thre…