Part 6330

<hw>Lac`tu*ca"ri*um</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[NL., fr. L. <ets>lactuca</ets> lettuce.]</ety> <def>The inspissated juice of the common lettuce, sometimes used as a substitute for opium.</def>

<h1>Lactucic</h1> <Xpage=823>

<hw>Lac*tu"cic</hw> <tt>(?)</tt>, <tt>a.</tt> <fld>(Chem.)</fld> <def>Pertaining to, or derived from, the juice of the <spn>Lactuca virosa</spn>; -- said of certain acids.</def>

<h1>Lactucin</h1> <Xpage=823>

<hw>Lac*tu"cin</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[From <er>Lactuca</er>: cf. F. <ets>lactucine</ets>.]</ety> <fld>(Chem.)</fld> <def>A white, crystalline substance, having a bitter taste and a neutral reaction, and forming one of the essential ingredients of lactucarium.</def>

<h1>Lactucone</h1> <Xpage=823>

<hw>Lac*tu"cone</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[From <er>Lactuca</er>.]</ety> <fld>(Chem.)</fld> <def>A white, crystalline, tasteless substance, found in the milky sap of species of Lactuca, and constituting an essential ingredient of lactucarium.</def>

<h1>Lacturamic</h1> <Xpage=823>

<hw>Lac`tu*ram"ic</hw> <tt>(<?/)</tt>, <tt>a.</tt> <ety>[<ets>Lactic</ets> + <ets>urea</ets> + <ets>amic</ets>.]</ety> <fld>(Chem.)</fld> <def>Pertaining to, or designating, an organic amido acid, which is regarded as a derivative of lactic acid and urea.</def>

<h1>Lactyl</h1> <Xpage=823>

<hw>Lac"tyl</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Lactic</ets> + <ets>-yl</ets>.]</ety> <fld>(Chem.)</fld> <def>An organic residue or radical derived from lactic acid.</def>

<h1>Lacuna</h1> <Xpage=823>

<hw>La*cu"na</hw> <tt>(?)</tt>, <tt>n.</tt>; <plu>pl. L. <plw>Lacun\'91</plw> <tt>(#)</tt>; E. <plw>Lacunas</plw> <tt>(#)</tt></plu>. <ety>[L., ditch, pit, lake, orig., anything hollow. See <er>Lagoon</er>.]</ety> <p><b>1.</b> <def>A small opening; a small pit or depression; a small blank space; a gap or vacancy; a hiatus.</def>

<p><b>2.</b> <fld>(Biol.)</fld> <def>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.</def>

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<h1>Lacunal, Lacunar</h1> <Xpage=824>

<hw><hw>La*cu"nal</hw> <tt>(?)</tt>, <hw>La*cu"nar</hw> <tt>(?)</tt>,<hw> <tt>a.</tt> <def>Pertaining to, or having, lacun\'91; <as>as, a <ex>lacunar</ex> circulation</as>.</def>

<h1>Lacunar</h1> <Xpage=824>

<hw>La*cu"nar</hw>, <tt>n.</tt>; <plu>pl. <i>E</i>. <plw>Lacunars</plw> <tt>(#)</tt>, L. <plw>Lacunaria</plw> <tt>(#)</tt></plu>. <ety>[L.]</ety> <fld>(Arch.)</fld> <sd>(a)</sd> <def>The ceiling or under surface of any part, especially when it consists of compartments, sunk or hollowed without spaces or bands between the panels. <i>Gwilt</i></def> <sd>(b)</sd> <def>One of the sunken panels in such a ceiling.</def>

<h1>Lacune</h1> <Xpage=824>

<hw>La*cune"</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[F.]</ety> <def>A lacuna.</def> <mark>[R.]</mark> <i>Landor</i>.

<h1>Lacunose, Lacunous</h1> <Xpage=824>

<hw><hw>Lac"u*nose`</hw> <tt>(?)</tt>, <hw>La*cu"nous</hw> <tt>(?)</tt>,<hw> <tt>a.</tt> <ety>[L. <ets>lacunosus</ets> full of holes or hollows; cf. F. <ets>lacuneux</ets>. See <er>Lacuna</er>.]</ety> <fld>(Biol.)</fld> <def>Furrowed or pitted; having shallow cavities or lacun\'91; <as>as, a <ex>lacunose</ex> leaf</as>.</def>

<h1>Lacustral, Lacustrine</h1> <Xpage=824>

<hw><hw>La*cus"tral</hw> <tt>(?)</tt>, <hw>La*cus"trine</hw> <tt>(?)</tt>,<hw> <tt>a.</tt> <ety>[L. <ets>lacus</ets> lake: cf. F. <ets>lacustral</ets>, <ets>lacustre</ets>.]</ety> <def>Found in, or pertaining to, lakes or ponds, or growing in them; <as>as, <ex>lacustrine</ex> flowers</as>.</def>

<cs><col>Lacustrine deposits</col> <fld>(Geol.)</fld>, <cd>the deposits which have been accumulated in fresh-water areas.</cd> -- <col>Lacustrine dwellings</col>. <cd>See <cref>Lake dwellings</cref>, under <er>Lake</er>.</cd></cs>

<h1>Lacwork</h1> <Xpage=824>

<hw>Lac"work`</hw> <tt>(?)</tt>, <tt>n.</tt> <def>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.</def>