tribrach

[trahy-brak, trib-rak]
noun
Prosody. a foot of three short syllables.

Origin:
< Latin tribrachys < Greek tríbrachys, equivalent to tri- tri- + brachýs short; see brachy-

tribrachic, adjective
tribrachial, adjective
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tribrach1 (ˈtraɪbræk, ˈtrɪb-)
 
n
prosody a metrical foot of three short syllables (⏑⏑⏑)
 
[C16: from Latin tribrachys, from Greek tribrakhus, from tri- + brakhus short]
 
tri'brachic1
 
adj
 
tri'brachial1
 
adj

tribrach2 (ˈtrɪbræk)
 
n
archaeol a three-armed object, esp a flint implement
 
[C19: from tri- + Greek brakhiōn arm]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Plummets, which cannot be rotated about a point, are checked through the use of
  a test ring mounted on a second tribrach.
If a total station is to be used, remove the instrument from the tribrach.
Never leave an instrument or its tribrach on the tripod without securing either
  to the tripod.
Center and level the instrument over the mark using only the tribrach.
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