mid-13c., "bird's bill," from Old French bec "beak," figuratively "mouth," also "tip or point of a nose, a lance, a ship, or a shoe," from Late Latin beccus (source also of Italian becco, Spanish pico), by the Romans said to be of Gaulish origin, perhaps from Gaulish beccus, and possibly related to the Celtic stem *bacc- "hook." Or there may be a link in Old English becca "pickax, sharp end." The modern jocular sense of "human nose" is from 1854 (the word was used mid-15c. in the same sense).
"open large-mouthed vessel," mid-14c., from Old Norse bikarr or Middle Dutch beker "goblet," probably (with Old Saxon bikeri, Old High German behhari, German Becher) from Medieval Latin bicarium, which is probably a diminutive of Greek bikos "earthenware jug, wine jar, vase with handles," also a unit of measure, a word of uncertain origin.
It is sometimes said to be a Semitic word, perhaps a borrowing from Syrian buqa "a two-handed vase or jug," or from Egyptian b:k.t "oil flask." The form has been assimilated in English to beak. Originally a drinking vessel; attested by 1877 in reference to a similar glass vessel used in scientific laboratories.
O for a beaker full of the warm South,
Full of the true, the blushful Hippocrene,
With beaded bubbles winking at the brim,
And purple-stained mouth;
That I might drink, and leave the world unseen,
And with thee fade away into the forest dim:
[Keats, from "Ode to a Nightingale"]
"beak or bill of a bird," Old English nebb "beak, nose; human face, countenance; beak-shaped thing," from Proto-Germanic nabja "beak, nose" (source also of Old Norse nef "beak, nose," Middle Dutch nebbe "beak," Old High German snabul, German Schnabel "beak," Old Frisian snavel "mouth"), which is of uncertain origin.
1580s, "beak or bill of a bird," Scottish variant of neb "beak or bill of a bird." Perhaps influenced by nibble (v.). Meaning "point" (of a pen or quill) is recorded by 1610s (neb in this sense is from 1590s).
"simple bridle-bit," 1530s, of uncertain origin, perhaps from or related to Dutch snavel "beak, bill;" compare German Schnabel "beak, face," Old English nebb, Old Norse neff "beak, nose" (see neb).
[bird's beak] Old English bill "bill, bird's beak," related to bill, a poetic word for a kind of sword (especially one with a hooked blade), from Proto-Germanic *bili-, a word for cutting or chopping weapons (see bill (n.3)). Used also in Middle English of beak-like projections of land (such as Portland Bill).
word-forming element used in making names for very small units of measure, 1915 (formally adopted as a scientific prefix meaning "one trillionth" by the International System of Units, 1960), from Spanish pico "a little over, a small balance," literally "sharp point, beak," a word of Celtic origin (compare Gaulish beccus "beak").
"of pertaining to or resembling a rostrum," c. 1400, from Late Latin rostralis, from Latin rostrum "beak" (see rostrum).