tri·brach

[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-

tri·brach·ic, adjective
tri·brach·i·al, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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tribrach1 (ˈtraɪbræk, ˈtrɪb-) [Click for IPA pronunciation guide]
 
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

00:10
Tribrach is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
tribrach2 (ˈtrɪbræk) [Click for IPA pronunciation guide]
 
n
archaeol a three-armed object, esp a flint implement
 
[C19: from tri- + Greek brakhiōn arm]

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Example sentences
All backsights and foresights will be to a prism secured to a tribrach and
  tripod.
Center and level the instrument over the mark using only the tribrach.
Plummets, which cannot be rotated about a point, are checked through the use of
  a test ring mounted on a second tribrach.
Never leave an instrument or its tribrach on the tripod without securing either
  to the tripod.
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