PTOLEMAIC
Ptol`e*ma"ic, a.
Defn: Of or pertaining to Ptolemy, the geographer and astronomer. Ptolemaic system (Astron.), the system maintained by Ptolemy, who supposed the earth to be fixed in the center of the universe, with the sun and stars revolving around it. This theory was received for ages, until superseded by the Copernican system.
PTOLEMAIST
Ptol"e*ma`ist, n.
Defn: One who accepts the astronomical system of Ptolemy.
PTOMAINE
Pto"ma*ine, n. Etym: [From Gr. (Physiol. Chem.)
Defn: One of a class of animal bases or alkaloids formed in the putrefaction of various kinds of albuminous matter, and closely related to the vegetable alkaloids; a cadaveric poison. The ptomaines, as a class, have their origin in dead matter, by which they are to be distinguished from the leucomaines.
PTOSIS
Pto"sis, n. Etym: [NL., fr. Gr. (Med.)
Defn: Drooping of the upper eyelid, produced by paralysis of its levator muscle.
PTYALIN
Pty"a*lin, n. Etym: [Gr. Ptyalism.] (Physiol. Chem.)
Defn: An unorganized amylolytic ferment, on enzyme, present in human mixed saliva and in the saliva of some animals.