noun, feminine/ˌʝabe fɾanˈθesa/plural: llaves francesas
adjustable spanner (UK), adjustable wrench (US), adjustable wrench (US), crescent wrench (US), crescent spanner (AU, NZ)
Synonyms: llave inglesa, llave ajustable
From llave (“key”) + francés (“French”). Literally, “French key”.