Any one of numerous species of small singing birds more or less resembling the true wrens in size and habits. [
1913 Webster]
" Among these are several species of European warblers; as, the reed wren (see Reed warbler (a), under Reed), the sedge wren (see Sedge warbler, under Sedge), the willow wren (see Willow warbler, under Willow), the golden-crested wren, and the ruby-crowned wren (see Kinglet)."
[1913 Webster]