cyclopropane(n = noun.artifact) - a colorless flammable gas sometimes used as an inhalation anesthetic;
is a kind of inhalation anaesthetic, inhalation anesthetic, inhalation general anaesthetic, inhalation general anesthetic

   a colorless flammable gas (C3H6) with a three-carbon ring, sometimes used as an anesthetic. [WordNet 1.5]

cyclopropane, n. Chem. a colourless gaseous cycloalkane used as a general anaesthetic.

Usage:
Chem. formula: C3H6