"written statement," mid-14c., from Anglo-L. billa "list," from M.L. bulla "decree, seal, sealed document," in classical L. "bubble, boss, stud, amulet for the neck" (hence "seal;" see bull
(2)). Sense of "account, invoice" first recorded c.1400; that of "order to pay" (technically
bill of exchange) is from 1570s; that of "paper money" is from 1660s. Meaning "draft of an act of Parliament" is from 1510s. The verb meaning "to send someone a bill of charge" is from 1867.
"bird's beak," O.E., related to bill, a poetic word for "a kind of sword" (especially one with a hooked blade), from a common Germanic word for cutting or chopping weapons (cf. O.H.G. bihal, O.N. bilda "hatchet," O.S. bil "sword"), from PIE base *bheie- "to cut, to strike." Used also in M.E. of beak-like
projections of land.