Lewis & Short

mēcōnĭum, ii, n., = μηκώνιον.

  1. I. Poppy-juice, Plin. 20, 18, 76, § 202; 25, 12, 91, § 142.
  2. II. A plant, called also peplis, Plin. 27, 12, 93, § 119.
  3. III. The excrements of new-born children, Plin. 28, 4, 13, § 52.