Found 2 items, similar to laughing gas.
English → English (WordNet) Definition: laughing gas laughing gas n : inhalation anesthetic used as an anesthetic in dentistry and surgery [syn: nitrous oxide]
English → English (gcide) Definition: Laughing gas Laughing \Laugh"ing\, a. & n. from Laugh, v. i. [1913 Webster] Laughing falcon (Zo["o]l.), a South American hawk (Herpetotheres cachinnans); -- so called from its notes, which resemble a shrill laugh. Laughing gas (Chem.), hyponitrous oxide, or protoxide of nitrogen Laughing goose (Zo["o]l.), the European white-fronted goose. Laughing gull. (Zo["o]l.) (a) A common European gull (Xema ridibundus); -- called also pewit, black cap, red-legged gull, and sea crow . (b) An American gull (Larus atricilla). In summer the head is nearly black, the back slate color, and the five outer primaries black. Laughing hyena (Zo["o]l.), the spotted hyena. See Hyena. Laughing jackass (Zo["o]l.), the great brown kingfisher (Dacelo gigas), of Australia; -- called also giant kingfisher , and gogobera. Laughing owl (Zo["o]l.), a peculiar owl (Sceloglaux albifacies ) of New Zealand, said to be on the verge of extinction. The name alludes to its notes. [1913 Webster]