Etymology: < -tomy comb. form + -ist suffix, probably after anatomist n.Compare French -tomiste , post-classical Latin -tomista (both 16th cent.), both earliest and chiefly in agent nouns formed from nouns in -tomie and -tomia respectively. Attested earliest in the 16th cent. in the Latin loan anatomist n., which probably served as the model for many subsequent formations on nouns in -tomy comb. form (or their foreign-language etymons) from the 17th cent. onwards, e.g. phlebotomist n., myotomist n., neurotomist n. Formations within English where any counterparts in -tomy comb. form are first attested later, i.e. what appear to be entirely new formations with the combining form, are found from the late 17th cent., e.g. bronchotomist n., hippotomist n. Chiefly combining with first elements ultimately of Greek origin.
This entry has been updated (OED Third Edition, January 2018).