ULTRAMICROSCOPIC

\ˌʊltɹɐmˌa͡ɪkɹəskˈɒpɪk], \ˌʊltɹɐmˌa‍ɪkɹəskˈɒpɪk], \ˌʊ_l_t_ɹ_ɐ_m_ˌaɪ_k_ɹ_ə_s_k_ˈɒ_p_ɪ_k]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe