Added 10 October 2026 finback noun Categories: AnimalsObscure Words noun ! Definition from WordNet 3.1, Princeton University. More about finback at Wordnik → Where our words come from → Large flat-headed whalebone whale having deep furrows along the throat; of Atlantic and Pacific. Origin From fin + back. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: whalewhalesfinnerrazorbackbaleenbackfin Back to today's word