insessores

Century Dictionary and Cyclopedia

1. In ornithology: The perchers; in Vigors's system of classification, adopted by Swainson and many others, an extensive order of birds, of arboreal habits, having the feet fitted for perching, with 3 toes in front and 1 behind, and not raptorial. A majority of all birds were included in this order, of which the leading types were Conirostres, Dentirostres, Tenuirostres, and Fissirostres. The group thus constituted corresponds exactly to no modern order, but is nearly equivalent to Passeres together with those Picariœ which are not yoke-toed, thus including all the true passerine or passeriform birds, and many others. The term has been used with varying latitude of definition, and is now obsolete, the group of birds it designated being an artificial one.

GNU Webster's 1913

1. n. (Zoöl.) An order of birds, formerly established to include the perching birds, but now generally regarded as an artificial group.

WordNet 3.0

1. n. a bird with feet adapted for perching (as on tree branches); this order is now generally abandoned by taxonomists