noun, masculine/ɡusaˈniʝo/plural: gusanillos
diminutive of gusano; spiral binding; bug, bugbear
Etymology tree Spanish gusano Proto-Indo-European *-lós Proto-Indo-European *-elós Proto-Italic *-elos Latin -lus Latin -ellus Old Spanish -iello Spanish -illo Spanish gusanillo From gusano + -illo.