sax ‧ o ‧ phone /ˈsæksəfəʊn $ -foʊn/ BrE AmE ( also sax /sæks/ informal ) noun [countable]
[ Date: 1800-1900 ; Language: French ; Origin: from Adolphe Sax (1814-94), Belgian musician who invented the instrument ]
a curved musical instrument made of metal that you play by blowing into it and pressing buttons, used especially in popular music and ↑ jazz