anatomy: [14] Etymologically, anatomy means ‘cutting up’ (the Greek noun anatomíā was compounded from the prefix ana- ‘up’ and the base *tom-, which figures in several English surgical terms, such as tonsillectomy [19], as well as in atom and tome), and when it first came into English it meant literally ‘dissection’ as well as ‘science of bodily structure’.
From the 16th century to the early 19th century it was also used for ‘skeleton’, and in this sense it was often misanalysed as an atomy, as if the initial anwere the indefinite article: ‘My bones … will be taken up smooth, and white, and bare as an atomy’, Tobias Smollett, Don Quixote 1755. => atom, tome
anatomy (n.)
late 14c., "study of the structure of living beings;" c. 1400, "anatomical structures," from Old French anatomie, from Late Latin anatomia, from Greek anatomia, from anatome "dissection," from ana- "up" (see ana-) + temnein "to cut" (see tome). "Dissection" (1540s), "mummy" (1580s), and "skeleton" (1590s) were primary senses of this word in Shakespeare's day; meaning "the science of the structure of organized bodies" predominated from 17c. Often mistakenly divided as an atomy or a natomy.
The scyence of the Nathomy is nedefull and necessarye to the Cyrurgyen [1541]