Etymology
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barb (n.)

late 14c., "barb of an arrow," from Old French barbe "beard, beard-like appendage" (11c.), from Latin barba "beard," from Proto-Italic *farfa- "beard," which might be from a common PIE root *bhardhā- "beard" (source also of Old Church Slavonic brada, Russia boroda, Lithuanian barzda, Old Prussian bordus), but according to De Vaan the vowel "rather points to a non-IE borrowing into the European languages."

barb (v.)

late 15c., "to clip, mow" (a sense now archaic or obsolete); see barb (n.). Meaning "to fit or furnish with barbs" is from 1610s. Related: Barbed; barbing.

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Definitions of barb
1
barb (n.)
an aggressive remark directed at a person like a missile and intended to have a telling effect;
Synonyms: shot / shaft / slam / dig / jibe / gibe
barb (n.)
the pointed part of barbed wire;
barb (n.)
a subsidiary point facing opposite from the main point that makes an arrowhead or spear hard to remove;
barb (n.)
one of the parallel filaments projecting from the main shaft of a feather;
2
barb (v.)
provide with barbs;
barbed wire
From wordnet.princeton.edu