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One of the primitive segments, or metameres, of an animal.

That one of a series of sulphides of any element which has the lowest proportion of sulphur; a sulphide with but one atom of sulphur in the molecule.

A protosulphide. [Obs.]

Same as Monotremata.

Same as Malacopoda.

rm; exemplar; archetype. They will turn their backs on it, like their great precursor and prototype. Burke.

embryo breaks up on either side of the anterior part of the notochord; a mesoblastic, or protovertebral, somite. See Illust. of Ectoderm.

Of or pertaining to the protovertebræ.

That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b). protoxide of nitrogen, laughing gas, now called hyponitrous oxideNO. See under Laughing.

To combine with oxygen, as any elementary substance, in such proportion as to form a protoxide.

The lowest of the grand divisions of the animal kingdom.

Of or pertaining to the Protozoa. -- n.

Of or pertaining to the Protozoa.

One of the Protozoa.

One of the primary, or first-formed, segments of an embryonic arthropod.

Same as Malacopoda.

To draw out or lengthen in time or (rarely) in space; to continue; to prolong; as, to protract an argument; to protract a war.

Prolonged; continued. Protracted meeting,a religious meeting continued for many successive days. [U. S.] -- Pro*tract"ed*ly, adv. -- Pro*tract"ed*ness, n.

A protractor.

Capable of being protracted, or protruded; protrusile.