Entry 1 sense Webster, 1913 Flycatcher /flīk'-ăchˌ-ẽr/ · Fly·catch·er · IPA /flˈaɪkˌætʃər/ 01 n. One of numerous species of birds that feed upon insects, which they take on the wing. 1. One of numerous species of birds that feed upon insects, which they take on the wing.(Zool.)