Wordnet 3.0
NOUN (1)
1. 
 substance discharged from the vagina (cellular debris and mucus and blood) that gradually decreases in amount during the weeks following childbirth; 
The Collaborative International Dictionary of English v.0.48:
Lochia \Lo*chi"a\ (l[=o]"k[i^]*[.a] or l[-o]*k[imac]"[.a]), n.
   pl. [NL., from Gr. ?, pl., fr. ? belonging to childbirth, ? a
   lying in, childbirth.] (Med.)
   The discharge from the womb and vagina which follows
   childbirth.
   [1913 Webster]
WordNet (r) 3.0 (2006):
lochia
    n 1: substance discharged from the vagina (cellular debris and
         mucus and blood) that gradually decreases in amount during
         the weeks following childbirth