[grun.ion] n [prob. fr. Sp grunon grunter] (1917): a silversides (Leuresthes tenuis) of the California coast notable for the regularity with which it comes inshore to spawn at nearly full moon
GRUNION
Meaning of GRUNION in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012