laughing

From laugh, v. i.

A South American hawk (Herpetotheres cachinnans); -- so called from its notes, which resemble a shrill laugh.

Hyponitrous oxide, or protoxide of nitrogen; -- so called from the exhilaration and laughing which it sometimes produces when inhaled. It is much used as an anæsthetic agent.

The European white-fronted goose.

An American gull (Larus atricilla). In summer the head is nearly black, the back slate color, and the five outer primaries black.