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