Part 6408

<cs><col>Laurentian period</col> <fld>(Geol.)</fld>, <cd>the lower of the two divisions of the Arch\'91an age; -- called also <altname>the Laurentian</altname>.</cd></cs>

<h1>Laurer</h1> <Xpage=834>

<hw>Lau"rer</hw> <tt>(?)</tt>, <tt>n.</tt> <def>Laurel.</def> <mark>[Obs.]</mark>

<i>Chaucer.</i>

<h1>Laurestine</h1> <Xpage=834>

<hw>Lau"res*tine</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[NL. <ets>lautus tinus</ets>, fr. L. <ets>laurus</ets> the laurel + <ets>tinus</ets> laurestine. See <er>Laurel</er>.]</ety> <fld>(Bot.)</fld> <def>The <spn>Viburnum Tinus</spn>, an evergreen shrub or tree of the south of Europe, which flowers during the winter mouths.</def> <altsp>[Written also <asp>laurustine</asp> and <asp>laurestina</asp>.]</altsp>

<h1>Lauric</h1> <Xpage=834>

<hw>Lau"ric</hw> <tt>(?)</tt>, <tt>a.</tt> <def>Pertaining to, or derived from, the European bay or laurel (<spn>Laurus nobilis</spn>).</def>

<cs><col>Lauric acid</col> <fld>(Chem.)</fld>, <cd>a white, crystalline substance, <chform>C12H24O2</chform>, resembling palmitic acid, and obtained from the fruit of the bay tree, and other sources.</cd></cs> <-- CH3(CH2)10COOH = dodecanoic acid, laurostearic acid, dodecoic acid. Obtained from various vegetable sources. Sodium salt used as a detergent. -->

<h1>Lauriferous</h1> <Xpage=834>

<hw>Lau*rif"er*ous</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[L. <ets>laurifer</ets>; <ets>laurus + ferre</ets> to bear.]</ety> <def>Producing, or bringing, laurel.</def>

<h1>Laurin</h1> <Xpage=834>

<hw>Lau"rin</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Cf. F. <ets>laurine</ets>.]</ety> <fld>(Chem.)</fld> <def>A white crystalline substance extracted from the fruit of the bay (<spn>Laurus nobilis</spn>), and consisting of a complex mixture of glycerin ethers of several organic acids.</def>

<h1>Laurinol</h1> <Xpage=834>

<hw>Lau"ri*nol</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Laurin</ets> + <ets>-ol</ets>.]</ety> <fld>(Chem.)</fld> <def>Ordinary camphor; -- so called in allusion to the family name (<spn>Laurace\'91</spn>) of the camphor trees. See <er>Camphor</er>.</def>

<h1>Lauriol</h1> <Xpage=834>

<hw>Lau"ri*ol</hw> <tt>(?)</tt>, <tt>n.</tt> <def>Spurge laurel.</def> <mark>[Obs.]</mark>

<i>Chaucer.</i>

<h1>Laurite</h1> <Xpage=834>

<hw>Lau"rite</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Etymol. uncertain.]</ety> <fld>(Min.)</fld> <def>A rare sulphide of osmium and ruthenium found with platinum in Borneo and Oregon.</def>

<h1>Laurone</h1> <Xpage=834>

<hw>Lau"rone</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Lauric</ets> + <ets>-one</ets>.]</ety> <fld>(Chem.)</fld> <def>The ketone of lauric acid.</def>

<h1>Laurus</h1> <Xpage=834>

<hw>Lau"rus</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[L., laurel.]</ety> <fld>(Bot.)</fld> <def>A genus of trees including, according to modern authors, only the true laurel (<spn>Laurus nobilis</spn>), and the larger <spn>L. Canariensis</spn> of Madeira and the Canary Islands. Formerly the sassafras, the camphor tree, the cinnamon tree, and several other aromatic trees and shrubs, were also referred to the genus <spn>Laurus</spn>.</def>

<h1>Laus</h1> <Xpage=834>

<hw>Laus</hw> <tt>(?)</tt>, <tt>a.</tt> <def>Loose.</def> <mark>[Obs.]</mark>

<i>Chaucer.</i>

<h1>Lava</h1> <Xpage=834>