The Collaborative International Dictionary of English v.0.48:

Charwoman \Char"wom`an\ (ch[^a]r"w[oo^]m`an), n.; pl.
   Charwomen (ch[^a]r"w[i^]m`[e^]n). [See Char a chore.]
   A woman hired for odd work or for single days.
   [1913 Webster]