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ter-trinal
ter-trinal adj.
Brit. 
/təːˈtrʌɪnl/
, /təːˈtrʌɪnl/U.S. /tərˈtraɪn(ə)l/
consisting of three sets of three./tərˈtraɪn(ə)l/ΚΠ
1876 T. Le M. Douse Grimm's Law §25. 53 It is certain that the symmetrical ter-trinal trinity constituted by all these three systems together cannot have existed from all time.
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