Phosphine

n. (Chemistry) colorless poisonous and flammable gas; derivatives of this gas

Phosphine is the common name for phosphorus hydride (PH3), also known by the IUPAC name phosphane and, occasionally, phosphamine. It is a colorless, flammable gas with a boiling point of −88 °C at  standard pressure. Pure phosphine is odorless, but technical grade phosphine has a highly unpleasant odor like garlic or rotting fish, due to the presence of substituted phosphine and diphosphine (P2H4). Phosphines are also a group of substituted phosphines, with the structure R3P, where other functional groups replace hydrogens. They are important in catalysts where they complex to various metal ions; a chiral metal phosphine complex can catalyze a reaction to give chiral products.
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Noun
1. a colorless gas with a strong fishy smell; used as a pesticide
(hypernym) gas

n. phosphine, (Chemistry) colorless poisonous and flammable gas; derivatives of this gas

n. phosphine (Chemistry); colorless poisonous and flammable gas; derivatives of this gas