PENTAVALENT

\pˈɛntɐvˌe͡ɪlənt], \pˈɛntɐvˌe‍ɪlənt], \p_ˈɛ_n_t_ɐ_v_ˌeɪ_l_ə_n_t]\
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2011 - English Dictionary Database
By DataStellar Co., Ltd
 
2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe