'Meconium' definitions:

Definition of 'meconium'

(from WordNet)
noun
Thick dark green mucoid material that is the first feces of a newborn child

Definition of 'Meconium'

From: GCIDE
  • Meconium \Me*co"ni*um\, n. [L., fr. Gr. ?, fr. ? poppy.] (Med.) (a) Opium. [Obs.] (b) The contents of the fetal intestine; hence, first excrement. [1913 Webster]