Branching in two, composed of two branches.

(Canada) In an educational institution, a course which is regarded as particularly easy.

(US, slang, military) A member of the United States armed forces having the rank of full colonel, as distinct from a lieutenant colonel.

Alternative form of bird colonel

Birth via the vagina (as opposed to caesarean section).

plural of accident of birth

plural of bird watcher

Alternative spelling of birdlime

Any of the repetitive spasms of pain associated with labour

plural of birth pang / (by extension) The difficulty associated with a new project.