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The inspissated juice of the common lettuce, sometimes used as a substitute for opium.

Pertaining to, or derived from, the juice of the Lactuca virosa; -- said of certain acids.

ng a bitter taste and a neutral reaction, and forming one of the essential ingredients of lactucarium.

A white, crystalline, tasteless substance, found in the milky sap of species of Lactuca, and constituting an essential ingredient of lactucarium.

ertaining to, or designating, an organic amido acid, which is regarded as a derivative of lactic acid and urea.

An organic residue or radical derived from lactic acid.

plants, or one of the spaces left among the tissues of the lower animals, which serve in place of vessels for the circulation of the body fluids, or the cavity or sac, usually of very small size, in a mucous membrane.

Pertaining to, or having, lacunæ; as, a lacunar circulation.

The ceiling or under surface of any part, especially when it consists of compartments, sunk or hollowed without spaces or bands between the panels. Gwilt

A lacuna. [R.] Landor.

Furrowed or pitted; having shallow cavities or lacunæ; as, a lacunose leaf.

Found in, or pertaining to, lakes or ponds, or growing in them; as, lacustrine flowers. Lacustrine deposits (Geol.), the deposits which have been accumulated in fresh-water areas. -- Lacustrine dwellings. See Lake dwellings, under Lake.

Ornamentation by means of lacquer painted or carved, or simply colored, sprinkled with gold or the like; -- said especially of Oriental work of this kind.

To wean. [R.] Bailey.

The weaning of a child from the breast, or of young beasts from their dam. Blount.

Next to the ambulacra; as, the adambulacral ossicles of the starfish.

Failure of the due secretion of milk after childbirth.

Lacking milk to suckle with.

Slacked, or pulverized, by exposure to the air; as, air-slacked lime.

An exclamation expressive of sorrow. [Archaic. or Poet.] Shak.