The Collaborative International Dictionary of English v.0.48:

Flyblow \Fly"blow`\, v. t.
   To deposit eggs upon, as a flesh fly does on meat; to cause
   to be maggoty; hence, to taint or contaminate, as if with
   flyblows. --Bp. Srillingfleet.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Flyblow \Fly"blow`\, n. (Zool.)
   One of the eggs or young larv[ae] deposited by a flesh fly,
   or blowfly.
   [1913 Webster]