MONOVALENT

\mˈɒnə͡ʊvˌe͡ɪlənt], \mˈɒnə‍ʊvˌe‍ɪlənt], \m_ˈɒ_n_əʊ_v_ˌeɪ_l_ə_n_t]\
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2006 - WordNet 3.0
By Princeton University
 
2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe