the first fecal excretion of a newborn child, composed chiefly of bile, mucus, and epithelial cells.
fecal mass released at pupation by the larvae of some insects.
the milky sap of the unripe seed pods of the opium poppy; crude opium.

1595–1605; < Latin < Greek mēkṓnion, diminutive of mḗkōn poppy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
meconium (mɪˈkəʊnɪəm)
1.  the dark green mucoid material that forms the first faeces of a newborn infant
2.  opium or the juice from the opium poppy
[C17: from New Latin, from Latin: poppy juice (used also of infant's excrement because of similarity in colour), from Greek mēkōneion, from mēkōn poppy]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"fecal discharge from a newborn infant," 1706, from L. meconium "excrement of a newborn child," from Gk. mekonion, lit. "poppy-juice, opium," dim. of mekon "poppy" (cognate with O.C.S. maku, Ger. Mohn "poppy"). So called by classical physicians for its resemblance.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

meconium me·co·ni·um (mĭ-kō'nē-əm)

  1. A dark green fecal material that accumulates in the fetal intestines and is discharged at or near the time of birth.

  2. See opium.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for meconium
Meconium ileus is a typical finding in newborn babies with cf.
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