Source : Webster's Revised Unabridged Dictionary (1913)

Lying-in \Ly"ing-in"\, n.
   1. The state attending, and consequent to, childbirth;
      confinement.

   2. The act of bearing a child.

Source : WordNet®

lying-in
     n : concluding state of pregnancy; from the onset of labor to
         the birth of a child; "she was in labor for six hours"
         [syn: {parturiency}, {labor}, {labour}, {confinement}, {travail},
          {childbed}]
     [also: {lyings-in} (pl)]