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tri-elementary
tri-elementary adj. 
/ˌtraɪɛləˈmɛntri/ composed of three elements.
Brit. /ˌtrʌɪɛlᵻˈmɛnt(ə)ri/
, /ˌtrʌɪɛlᵻˈmɛnt(ə)ri/U.S. /ˌtraɪɛləˈmɛn(t)əri/
, /ˌtraɪɛləˈmɛn(t)əri//ˌtraɪɛləˈmɛntri/ΘΚΠ
the world > matter > chemistry > elements and compounds > [adjective] > of or relating to compounds > by number of contitutive elements > three
ternary1808
tri-elementary1866
1866 W. Odling Lect. Animal Chem. 25 Comparing tri-elementary bodies of this kind with tri-elementary mineral substances.
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