neb n.

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).

1530s, nyppell, "protuberance of a mammalian breast," in a female the extremity where the milk-ducts discharge, alteration of neble (1520s), probably diminutive of neb "bill, beak, snout" (see neb), hence, literally "a small projection." Used from 1713 of any thing or mechanical part that projects like a nipple. From 1875 in reference to the mouthpiece of an infant's nursing-bottle. Earlier words were pap (n.2), teat. A 16c.-17c. slang term for a woman's nipples was cherrilets.

simple bridle-bit, 1530s, a word of uncertain origin, likely from or related to Dutch snavel "beak, bill; nose or snout of a beast;" compare German Schnabel "beak, face," Old English nebb, Old Norse neff "beak, nose" (see neb). Often figurative, in reference to loose restraint, etc. As a verb by 1550s. Related: Snaffled; snaffling.