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Any marine gastropod belonging to Pleurotoma, and ether allied genera of the family Pleurotmidæ. The species are very numerous, especially in tropical seas. The outer lip has usually a posterior notch or slit.

Of or pertaining to polycrotism; manifesting polycrotism; as, a polycrotic pulse; a polycrotic pulse curve.

ve, or sphygmogram, shows several secondary crests or elevations; -- contrasted with monocrotism and dicrotism.

A division of marsupials in which there are more fore incisor teeth in each jaw.

A medicine supposed to promote the formation of callus.

A copy of a print, writing, etc., made by placing it upon a chemically prepared paper which is acted upon by a gas which permeates the paper of the print, writing, etc.

sometimes seen in a pulse curve or sphygmogram, between the apex of the curve and the dicrotic wave. The predicrotic or tidal wave is best marked in a hard pulse, i. e., where the blood pressure is high. Landois & Stirling.

Giving a previous narrative or explanation, as of the plot or personages of a play; introductory. = 32,500 yrs.) Also called brevium, Uranium X2 and UX2.

A nitrogenous phosphorized principle found in brain tissue. By decomposition it yields neurine, fatty acids, and other bodies.

who takes lead in some great scene, enterprise, conflict, or the like. Shakespeare, the protagonist on the great of modern poetry. De Quincey.

An amorphous nitrogenous substance found in the spermatic fluid of salmon. It is soluble in water, which an alkaline reaction, and unites with acids and metallic bases.

Having male sexual organs while young, and female organs later in life. -- Pro*tan"trism, n.

Proterandrous.

A proposition; a maxim. Johnson.

Of or pertaining to the protasis of an ancient play; introductory.

Of or pertaining to the Proteaceæ, an order of apetalous evergreen shrubs, mostly natives of the Cape of Good Hope or of Australia.

Of or pertaining to Proteus; characteristic of Proteus. " Protean transformations." Cudworth.

In a protean manner. Cudworth.

r shield from danger or injury; to defend; to guard; to preserve in safety; as, a father protects his children. The gods of Greece protect you! Shak.

By way of protection; in a protective manner.