true flycatcher truef·ly·catc·her uncommon noun 1. any of a large group of small songbirds that feed on insects taken on the wing SynonymsOld World flycatchertrue flycatcherflycatcher Related words Broader terms oscine Narrower terms spotted flycatcherthickhead Parts Muscicapidae WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.