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Spanish word gusano comes from Latin cossus (Woodworm (worm or grub found in wood).)
cossus (Latin)
Woodworm (worm or grub found in wood).
gusano (Spanish)
(Cuba, derogatory) a person who has defected from Cuba. Insect larva, such as a grub, caterpillar, or maggot. Worm.