tervalency
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tervalency — ter·valency … English syllables
tervalent — tervalence, tervalency, n. /terr vay leuhnt/, adj. Chem. 1. trivalent. 2. possessing three different valences, as cobalt with valences 2, 3, and 4. [1900 05; TER + VALENT] * * * … Universalium