The Collaborative International Dictionary of English v.0.48:

agalactia \ag`a*lac"ti*a\ ([a^]g`[.a]*l[a^]k"t[i^]*[.a]),
agalaxy \ag"a*lax`y\ ([a^]g"[.a]*l[a^]k`s[y^]), n. [Gr.
   'agalakti`a; 'a priv. + ga`la, gala`ktos] (Med.)
   Failure of the due secretion of milk after childbirth. AS
   [1913 Webster]

WordNet (r) 3.0 (2006):

agalactia
    n 1: a condition in which milk is not secreted in the mother's
         breasts after her child has been delivered [syn:
         agalactia, agalactosis]