from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A small fish (Leuresthes tenuis) of coastal waters of California and Mexico that spawns at night along beaches during the high tides of spring and summer.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Either of two small fish, of the genus Leuresthes, found along the coast of Mexico and southern California, that spawn in the wet sand at certain high tides.
Perhaps from Spanish gruñón, grumbler, from gruñir, to grumble, grunt, from Latin grunnīre, grundīre, to grunt.(American Heritage® Dictionary of the English Language, Fourth Edition)