LETHAL DOSE

\lˈiːθə͡l dˈə͡ʊs], \lˈiːθə‍l dˈə‍ʊs], \l_ˈiː_θ_əl d_ˈəʊ_s]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland