Entry 1 sense Webster, 1913 Longtail · Long·tail · IPA 01 n. An animal, particularly a log, having an uncut tail. Cf. Curtail. Dog. 1. An animal, particularly a log, having an uncut tail. Cf. Curtail. Dog. See: Curtail, Dog Phrases & compounds Cut and longtail — all, gentlefolks and others, as they might come.