'By-blow' definitions:

Definition of 'by-blow'

(from WordNet)
noun
The illegitimate offspring of unmarried parents [syn: bastard, by-blow, love child, illegitimate child, illegitimate, whoreson]

Definition of 'By-blow'

From: GCIDE
  • By-blow \By"-blow`\, n.
  • 1. A side or incidental blow; an accidental blow. [1913 Webster]
  • With their by-blows they did split the very stones in pieces. --Bunyan. [1913 Webster]
  • 2. An illegitimate child; a bastard. [1913 Webster]
  • The Aga speedily . . . brought her [his disgraced slave] to court, together with her pretty by-blow, the present Padre Ottomano. --Evelyn. [1913 Webster]