ALLOTROPIC

\ˌalətɹˈɒpɪk], \ˌalətɹˈɒpɪk], \ˌa_l_ə_t_ɹ_ˈɒ_p_ɪ_k]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe