The Collaborative International Dictionary of English v.0.48:

Tonsillectomy \Ton`sil*lec"to*my\, n. (Surg.)
   The operation of removing the tonsils; -- formerly also
   called tonsilotomy.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tonsilotomy \Ton`sil*ot"o*my\, n. (Surg.)
   The operation of removing the tonsils, or a portion thereof;
   -- called more commonly tonsillectomy.
   [1913 Webster]