wren

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various small brownish songbirds of the family Troglodytidae, having rounded wings, a slender bill, and a short, often erect tail. All species but one, which is Eurasian, are found only in the Americas.
• noun Any of various similar unrelated songbirds.

from The Century Dictionary.

• noun A very small migratory and insectivorous singing-bird of Great Britain and other European countries, with a slender bill and extremely short tail, and of dark reddish-brown coloration varied with black, inhabiting shrubbery, and belonging to the family Troglodytidæ; hence, any member of this family, and, with a qualifying term, one of various other small birds of different families, as certain warblers, kinglets, etc. See the phrases below.
• noun The goldcrest or kinglet, Regulus cristatus. See cut under goldcrest.
• noun Uropsila leucogastra, of Oaxaca and Tamaulipas in Mexico, originally described by J. Gould in 1836 as Troglodytes leucogastra, a name subsequently misused to denote the white-bellied wren .
• noun (See also cactus-wren, cañon-wren, marsh-wren, reed-wren, tule-wren, willow-wren, wood-wren.)

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) Any one of numerous species of small singing birds belonging to Troglodytes and numerous allied of the family Troglodytidæ.
• noun (Zoöl.) Any one of numerous species of small singing birds more or less resembling the true wrens in size and habits.
• noun any one of numerous South American birds of the family Formicaridæ, allied to the ant thrushes.
• noun a small Australian singing bird (Malurus cyaneus), the male of which in the breeding season is bright blue. Called also superb warbler.
• noun See in the Vocabulary.
• noun any one of numerous species of small timaline birds belonging to Alcippe, Stachyris, Timalia, and several allied genera. These birds are common in Southern Asia and the East Indies.
• noun See Ground wren, under Ground.
• noun any one of several species of small Asiatic and African singing birds belonging to Prinia and allied genera. These birds are closely allied to the tailor birds, and build their nests in a similar manner. See also Pincpinc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Members of a mainly New World passerine bird family Troglodytidae.
• noun Small bird of similar appearance to a true wren.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun English architect who designed more than fifty London churches (1632-1723)
• noun any of several small active brown birds of the northern hemisphere with short upright tails; they feed on insects