triplex
AdjectiveUS[trih-pleks]/trɪˈplɛks/2 syllables
Open English WordNet
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Webster's Dictionary (1913)
Tri′plex adjective
Machinery Having three principal operative parts or motions, so as to produce a three-fold effect.
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54 · with additions: 1913 supplement