D defs.my
Entry 1 sense Webster, 1913

Propylene

/prōp-əl-ēn'/ · Pro·pyl·ene · IPA /proʊpəlˈiːn/
01 n. A colorless gaseous hydrocarbon (C3H6) of the ethylene series, having a garlic odor. It occurs in coal gas, and is produced artificially in…
  1. 1.
    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.(Chem.) Also: propene