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Protosulphide
n.
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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.
Protosulphuret
n.
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A protosulphide.
Prototheria
n. pl.
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Same as Monotremata.
Prototracheata
n. pl.
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Same as Malacopoda.
Prototype
n.
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An original or model after which anything is copied; the pattern of anything to be engraved, or otherwise copied, cast, or the like; a primary form; exemplar; archetype.
Protovertebrae
pl.
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of Protovertebra
Protovertebra
n.
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One of the primitive masses, or segments, into which the mesoblast of the vertebrate embryo breaks up on either side of the anterior part of the notochord; a mesoblastic, or protovertebral, somite. See Illust. of Ectoderm.
Protovertebral
a.
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Of or pertaining to the protovertebrae.
Protoxide
n.
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That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b).
Protoxidize
v. t.
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To combine with oxygen, as any elementary substance, in such proportion as to form a protoxide.
Protozoa
n. pl.
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The lowest of the grand divisions of the animal kingdom.
Protozoan
a.
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Of or pertaining to the Protozoa.
Protozoan
n.
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One of the Protozoa.
Protozoic
a.
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Of or pertaining to the Protozoa.
Protozoic
a.
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Containing remains of the earliest discovered life of the globe, which included mollusks, radiates and protozoans.
Protozoa
pl.
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of Protozoon
Protozoon
n.
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One of the Protozoa.
Protozoon
n.
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A single zooid of a compound protozoan.
Protozoonite
n.
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One of the primary, or first-formed, segments of an embryonic arthropod.
Protracheata
n. pl.
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Same as Malacopoda.
Protracted
imp. & p. p.
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of Protract
Protracting
p. pr. vb. n.
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of Protract
Protract
v. t.
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To draw out or lengthen in time or (rarely) in space; to continue; to prolong; as, to protract an argument; to protract a war.
Protract
v. t.
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To put off to a distant time; to delay; to defer; as, to protract a decision or duty.
Protract
v. t.
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To draw to a scale; to lay down the lines and angles of, with scale and protractor; to plot.
Protract
v. t.
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To extend; to protrude; as, the cat can protract its claws; -- opposed to retract.
Protract
n.
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Tedious continuance or delay.
Protracted
a.
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Prolonged; continued.
Protracter
n.
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A protractor.
Protractile
a.
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Capable of being protracted, or protruded; protrusile.