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Of or pertaining to the prothorax.

The first or anterior segment of the thorax in insects. See Illusts. of Butterfly and Coleoptera.

Same as Prothyalosoma.

One of the Protista.

A provisional group in which are placed a number of low microscopic organisms of doubtful nature. Some are probably plants, others animals.

One of the Protista.

A combining form prefix signifying first, primary, primordial; as, protomartyr, the first martyr; protomorphic, primitive in form; protoplast, a primordial organism; prototype, protozoan.

Pertaining to, or designating, architecture, in which the beginnings of the Doric style are supposed to be found.

Of or pertaining to the first canon, or that which contains the authorized collection of the books of Scripture; -- opposed to deutero-canonical.

Pertaining to, derived from, or designating, an organic acid which is obtained as a white crystalline substance from catechin, asafetida, oil of cloves, etc., and by distillation itself yields pyrocatechin.

Having a caudal fin extending around the end of the vertebral column, like that which is first formed in the embryo of fishes; diphycercal.

A genus of minute unicellular algæ including the red snow plant (Protococcus nivalis).

To make a protocol of.

One who draughts protocols.

The embryonic shell, or first chamber, of ammonites and other cephalopods.

A kind of granite or gneiss containing a silvery talcose mineral.

Same as Proterogynous.

A genus of fossil horses from the Lower Pliocene. They had three toes on each foot, the lateral ones being small.

The first martyr; the first who suffers, or is sacrificed, in any cause; -- applied esp. to Stephen, the first Christian martyr.

The second segment of one of the Gregarinæ.