noun
in fishes : a median unpaired fin on the lower posterior part of the body behind the vent and sometimes confluent with the caudal fin — see fish illustration
noun
in fishes : a median unpaired fin on the lower posterior part of the body behind the vent and sometimes confluent with the caudal fin — see fish illustration
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012