Source : Webster's Revised Unabridged Dictionary (1913)

Squill \Squill\, n. [F. squille (also scille a squill, in sense
   1), L. squilla, scilla, Gr. ?.]
   1. (Bot.)
      (a) A European bulbous liliaceous plant ({Urginea,
          formerly Scilla, maritima}), of acrid, expectorant,
          diuretic, and emetic properties used in medicine.
          Called also {sea onion}.
      (b) Any bulbous plant of the genus {Scilla}; as, the
          bluebell squill ({S. mutans}).

   2. (Zo["o]l.)
      (a) A squilla.
      (b) A mantis.

Source : WordNet®

squill
     n 1: bulb of the sea squill, which is sliced, dried, and used as
          an expectorant
     2: having dense spikes of small white flowers and yielding a
        bulb with medicinal properties [syn: {sea squill}, {sea
        onion}, {Urginea maritima}]
     3: an Old World plant of the genus Scilla having narrow basal
        leaves and pink or blue or white racemose flowers [syn: {scilla}]