OBSERVABLE

\ɒbzˈɜːvəbə͡l], \ɒbzˈɜːvəbə‍l], \ɒ_b_z_ˈɜː_v_ə_b_əl]\
Sort: Oldest first
 
1919 - The Winston Simplified Dictionary
By William Dodge Lewis, Edgar Arthur Singer
 
1899 - The american dictionary of the english language.
By Daniel Lyons