Etymology
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brachy- 
word-forming element meaning "short," from Latinized combining form of Greek brakhys "short," from PIE root *mregh-u- "short."
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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.
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turbo- 
word-forming element, abstracted c. 1900 from turbine; influenced by Latin turbo "spinning top." E.g. turbocharger (1934), aeronautic turboprop (1945, with second element short for propeller); turbojet (1945).
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piezo- 

word-forming element meaning "pressure," from Greek piezein "to press tight, squeeze," from PIE *pisedyo- "to sit upon" (source also of Sanskrit pidayati "presses, oppresses"), from *pi "on," short for *epi (see epi-) + root *sed- (1) "to sit." First in piezometer (1820), an instrument for ascertaining or testing pressure. It was in common use in word formation from c. 1900.

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