Etymology
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Words related to brace

bracer (n.)
early 14c., "piece of armor protecting the arm;" 1580s, "a clamp, bind, that which braces or makes firm," agent noun from brace (v.). Figurative sense of "that which braces the nerves" is 1740; especially an alcoholic drink taken early in the morning (by 1826). Related: Bracers.
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brachio- 
before a vowel, brachi-, word-forming element meaning "arm, of the upper arm, pertaining to the upper arm and," from Greek brakhion "arm," perhaps originally "upper arm," literally "shorter," from brakhys "short" (from PIE root *mregh-u- "short"), in contrast to the longer forearm.
*mregh-u- 
Proto-Indo-European root meaning "short."

It forms all or part of: abbreviate; abbreviation; abridge; amphibrach; brace; bracelet; brachio-; brachiopod; brachiosaurus; brachy-; brassiere; breviary; brevity; brief; brumal; brume; embrace; merry; mirth; pretzel; vambrace.

It is the hypothetical source of/evidence for its existence is provided by: Greek brakhys "short;" Latin brevis "short, low, little, shallow;" Old Church Slavonic bruzeja "shallow places, shoals;" Gothic gamaurgjan "to shorten."
vambrace (n.)
armor or guard for the forearm, early 14c., from Anglo-French vant-bras, from Old French avant-bras, from avant "before, in front of" (see avant) + bras "an arm" (see brace (n.)).