(zoology) Having two heads.

(sometimes proscribed) A biceps.

(anatomy) Any muscle having two heads. / Specifically, the biceps brachii, the flexor of the elbow. / (informal) The upper arm, especially the collective muscles of the upper arm.

(anatomy) The flexor in the upper arm.

A 200th anniversary.

plural of bicentenary

plural of bicentennial

(rare) plural of biceps

(not comparable) Having two centres. / (comparable, LGBT) Having a bisexual bias or basis.

(bodybuilding) A standard pose in which both sets of biceps are flexed and the chest is thrust forward.