barn swallow

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A widely distributed bird (Hirundo rustica) that nests in barns and caves and has a deeply forked tail, a dark-blue back, and tan underparts.

Century Dictionary and Cyclopedia

1. n. The common swallow of the United States, Hirundo horreorum or H. erythrogastra: so called because it habitually breeds in barns. The upper parts are dark steel-blue, the lower parts chestnut with an imperfect collar, and the tail deeply forked and spotted with white. It is the American representative of the similar H. rustica of Europe.

Wiktionary

1. n. The most widespread species of swallow in the world; a distinctive passerine bird with blue upperparts, a long, deeply forked tail and curved, pointed wings, is found in Europe, Asia, Africa and the Americas.

GNU Webster's 1913

1. n. (Zoöl.) the common American swallow (Hirundo horreorum), which attaches its nest of mud to the beams and rafters of barns.

WordNet 3.0

1. n. common swallow of North America and Europe that nests in barns etc.