Etymology
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tonsillectomy (n.)

1899, from combining form of tonsil + -ectomy "a cutting, surgical removal." A hybrid with a Latin front end and a Greek ending. A correct formation all from Greek would be amygdalectomy.

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Definitions of tonsillectomy

tonsillectomy (n.)
surgical removal of the palatine tonsils; commonly performed along with adenoidectomy;
From wordnet.princeton.edu