Piscine organ (4)
I believe the answer is:
gill
(Other definitions for gill that I've seen before include "Fish's breathing apparatus" , "Breathing organ in fish" , "Eric ---, sculptor; breathing organ" , "ravine" , "One quarter of a pint" .)
I believe the answer is:
gill
(Other definitions for gill that I've seen before include "Fish's breathing apparatus" , "Breathing organ in fish" , "Eric ---, sculptor; breathing organ" , "ravine" , "One quarter of a pint" .)