PROPYLENE
Pro"pyl*ene, n. Etym: [Cf. F. propylène.] (Chem.)
Defn: A colorless gaseous hydrocarbon (C3H6) of the ethylene series, having a garlic odor. It occurs in coal gas, and is produced artificially in various ways. Called also propene.
PROPYLIC
Pro*pyl"ic, a. (Chem.)
Defn: Pertaining to, derived from, or containing, propyl; as, propylic alcohol.
PROPYLIDENE
Pro*pyl"i*dene, n. (Chem.)
Defn: See Propidene.
PROPYLON
Prop"y*lon, n.; pl. Propyla. Etym: [NL., from Gr. (Anc. Arch.)
Defn: The porch, vestibule, or entrance of an edifice.
PRO RATA
Pro` ra"ta. Etym: [L.]
Defn: In proportion; proportionately; according to the share, interest, or liability of each.