||Lac*tu"ca (?), n. [L., lettuce. See Lettuce.] (Bot.) A genus of
||composite herbs, several of which are cultivated for salad; lettuce.
||
||Lac`tu*ca"ri*um (?), n. [NL., fr. L. lactuca lettuce.] The
||inspissated juice of the common lettuce, sometimes used as a
||substitute for opium.
||
Lac*tu"cic (?), a. (Chem.) Pertaining to, or derived from, the juice of
the Lactuca virosa; -- said of certain acids.
Lac*tu"cin (?), n. [From Lactuca: cf. F. lactucine.] (Chem.) A white,
crystalline substance, having a bitter taste and a neutral reaction,
and forming one of the essential ingredients of lactucarium.
Lac*tu"cone (?), n. [From Lactuca.] (Chem.) A white, crystalline,
tasteless substance, found in the milky sap of species of Lactuca, and
constituting an essential ingredient of lactucarium.
Lac`tu*ram"ic (&?;), a. [Lactic + urea + amic.] (Chem.) Pertaining to,
or designating, an organic amido acid, which is regarded as a
derivative of lactic acid and urea.
Lac"tyl (?), n. [Lactic + - yl.] (Chem.) An organic residue or radical
derived from lactic acid.
||La*cu"na (l*k"n), n.; pl. L. Lacunæ (#); E. Lacunas (#). [L., ditch,
||pit, lake, orig., anything hollow. See Lagoon.] 1. A small opening; a
||small pit or depression; a small blank space; a gap or vacancy; a
||hiatus.
||
2. (Biol.) A small opening; a small depression or cavity; a space, as a
vacant space between the cells of 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.
<! p. 824 !>
{ La*cu"nal (l*k"nal), La*cu"nar (l*k"nr), } a. Pertaining to, or
having, lacunæ; as, a lacunar circulation.
La*cu"nar, n.; pl. E. Lacunars (#), L. Lacunaria (#). [L.] (Arch.) (a)
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 (b) One of the sunken panels in such a ceiling.
La*cune" (l*kn"), n. [F.] A lacuna. [R.] Landor.
{ Lac"u*nose` (?), La*cu"nous (?), } a. [L. lacunosus full of holes or
hollows; cf. F. lacuneux. See Lacuna.] (Biol.) Furrowed or pitted;
having shallow cavities or lacunæ; as, a lacunose leaf.
{ La*cus"tral (?), La*cus"trine (?), } a. [L. lacus lake: cf. F.
lacustral, lacustre.] 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.
Lac"work` (?), n. 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.
Lad (ld), obs. p. p. of Lead, to guide. Chaucer.
Lad (ld), n. [OE. ladde, of Celtic origin; cf. W. llawd, Ir. lath.
√123. Cf. Lass.] 1. A boy; a youth; a stripling. "Cupid is a
knavish lad." Shak.
There is a lad here, which hath five barley loaves and two small
fishes.
John vi. 9.