bi ‧ op ‧ sy /ˈbaɪɒpsi $ -ɑːp-/ BrE AmE noun ( plural biopsies ) [countable]
[ Date: 1800-1900 ; Origin: bio- + Greek opsis 'appearance' ]
the removal of cells, ↑ tissue etc from someone’s body in order to find out more about a disease they may have:
a breast biopsy