TETRAVALENT

\tˈɛtɹɐvˌe͡ɪlənt], \tˈɛtɹɐvˌe‍ɪlənt], \t_ˈɛ_t_ɹ_ɐ_v_ˌeɪ_l_ə_n_t]\
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2006 - WordNet 3.0
By Princeton University
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe