Pet`ro*mas"toid (?), a. [Petro + mastoid.] (Anat.) Of or pertaining to
the petrous and mastoid parts of the temporal bone, periotic.
Pet`ro*my"zont (?), n. [Petro + Gr. &?; to suck in.] (Zoˆl.) A lamprey.
Pet`ro*nel (?), n. [OF. petrinal, fr. peitrine, petrine, the breast, F.
poitrine; so called because it was placed against the breast in order
to fire. See Poitrel.] A sort of hand cannon, or portable firearm, used
in France in the 15th century.
Pe*tro"sal (?), a. [See Petrous.] (Anat.) (a) Hard; stony; petrous; as,
the petrosal bone; petrosal part of the temporal bone. (b) Of,
pertaining to, or in the region of, the petrous, or petrosal, bone, or
the corresponding part of the temporal bone.
Petrosal bone (Anat.), a bone corresponding to the petrous portion of
the temporal bone of man; or one forming more or less of the periotic
capsule.
Pe*tro"sal, n. (Anat.) (a) A petrosal bone. (b) The auditory capsule.
Owen.
Pet`ro*si"lex (?), n. [Petro + silex.] (Min.) Felsite.
Pet`ro*si*li"cious (?), a. Containing, or consisting of, petrosilex.
Pet`ro*ste"a*rine (?), n. [Petro + stearine.] A solid unctuous
material, of which candles are made.
Pe"trous (?), a. [L. petrosus, fr. petra a stone.] 1. Like stone; hard;
stony; rocky; as, the petrous part of the temporal bone. Hooper.