The Collaborative International Dictionary of English v.0.48:

Child \Child\ (ch[imac]ld), n.; pl. Children
   (ch[i^]l"dr[e^]n). [AS. cild, pl. cildru; cf. Goth.
   kil[thorn]ei womb, in-kil[thorn][=o] with child.]
   1. A son or a daughter; a male or female descendant, in the
      first degree; the immediate progeny of human parents; --
      in law, legitimate offspring. Used also of animals and
      plants.
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   2. A descendant, however remote; -- used esp. in the plural;
      as, the children of Israel; the children of Edom.
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   3. One who, by character of practice, shows signs of
      relationship to, or of the influence of, another; one
      closely connected with a place, occupation, character,
      etc.; as, a child of God; a child of the devil; a child of
      disobedience; a child of toil; a child of the people.
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   4. A noble youth. See Childe. [Obs.] --Chaucer.
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   5. A young person of either sex. esp. one between infancy and
      youth; hence, one who exhibits the characteristics of a
      very young person, as innocence, obedience, trustfulness,
      limited understanding, etc.
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            When I was child. I spake as a child, I understood
            as a child, I thought as a child; but when I became
            a man, I put away childish things.    --1. Cor. xii.
                                                  11.
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   6. A female infant. [Obs.]
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            A boy or a child, I wonder?           --Shak.
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   To be with child, to be pregnant.

   Child's play, light work; a trifling contest.
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The Collaborative International Dictionary of English v.0.48:

Children \Chil"dren\, n.;
   pl. of Child.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "children":
   babyhood, boyhood, breed, brood, childkind, descendants, descent,
   family, folks, fruit, get, girlhood, grandchildren,
   great-grandchildren, hearth, heirs, homefolks, hostages to fortune,
   house, household, inheritors, issue, kids, lineage, little kids,
   little ones, menage, new generation, offspring, people, posterity,
   progeny, rising generation, seed, small fry, sons, succession,
   tots, treasures, young, young blood, young fry, young people,
   younglings, youngsters, youth