Part 1156

<h1>Bivalve</h1> <Xpage=150>

<hw>Bi"valve</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[F. <ets>bivalve</ets>; <ets>bi-</ets> (L. <ets>bis</ets>) + <ets>valve</ets> valve.]</ety> <p><b>1.</b> <fld>(Zo\'94l.)</fld> <def>A mollusk having a shell consisting of two lateral plates or valves joined together by an elastic ligament at the hinge, which is usually strengthened by prominences called <i>teeth</i>. The shell is closed by the contraction of two transverse muscles attached to the inner surface, as in the clam, -- or by one, as in the oyster. See Mollusca.</def>

<p><b>2.</b> <fld>(Bot.)</fld> <def>A pericarp in which the seed case opens or splits into two parts or valves.</def>

<h1>Bivalve</h1> <Xpage=150>

<hw>Bi"valve</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[Pref. <ets>bi-</ets> + <ets>valve</ets>.]</ety> <fld>(Zo\'94l. & Bot.)</fld> <def>Having two shells or valves which open and shut, as the oyster and certain seed vessels.</def>

<h1>Bivalved</h1> <Xpage=150>

<hw>Bi"valved</hw> <tt>(?)</tt>, <tt>a.</tt> <def>Having two valves, as the oyster and some seed pods; bivalve.</def>

<h1>Bivalvous</h1> <Xpage=150>

<hw>Bi*val"vous</hw> <tt>(?)</tt>, <tt>a.</tt> <def>Bivalvular.</def>

<h1>Bivalvular</h1> <Xpage=150>

<hw>Bi*val"vu*lar</hw> <tt>(?)</tt>, <tt>a.</tt> <def>Having two valves.</def>

<h1>Bivaulted</h1> <Xpage=150>

<hw>Bi*vault"ed</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[Pref. <ets>bi-</ets> + <ets>vault</ets>.]</ety> <def>Having two vaults or arches.</def>

<h1>Bivector</h1> <Xpage=150>

<hw>Bi*vec"tor</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Pref. <ets>bi-</ets> + <ets>vector</ets>.]</ety> <fld>(Math.)</fld> <def>A term made up of the two parts <?/ + <?/1 <?/-1, where <?/ and <?/1 are vectors.</def>

<h1>Biventral</h1> <Xpage=150>

<hw>Bi*ven"tral</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[Pref. <ets>bi-</ets> + <ets>ventral</ets>.]</ety> <def>(Anat.) Having two bellies or protuberances; <as>as, a <ex>biventral</ex>, or digastric, muscle, or the <ex>biventral</ex> lobe of the cerebellum</as>.</def>

<h1>Bivial</h1> <Xpage=150>

<hw>Biv"i*al</hw> <tt>(?)</tt>, <tt>a.</tt> <def>Of or relating to the bivium.</def>

<h1>Bivious</h1> <Xpage=150>

<hw>Biv"i*ous</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[L. <ets>bivius</ets>; <ets>bis</ets> twice + <ets>via</ets> way.]</ety> <def>Having, or leading, two ways.</def>

<blockquote><b>Bivious</b> theorems and Janus-faced doctrines. <i>Sir T. Browne.</i></blockquote>

<h1>Bivium</h1> <Xpage=150>

<hw>Biv"i*um</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[L., a place with two ways. See <er>Bivious</er>.]</ety> <fld>(Zo\'94l.)</fld> <def>One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (<i>trivium</i>), which includes three ambulacra.</def>

<h1>Bivouac</h1> <Xpage=150>

<hw>Biv"ouac</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[F. <ets>bivouac</ets>, <ets>bivac</ets>, prab. fr. G. <ets>beiwache</ets>, or <ets>beiwacht</ets>; <ets>bei</ets> by, near + <ets>wachen</ets> to watch, <ets>wache</ets> watch, guard. See <er>By</er>, and <er>Watch</er>.]</ety> <fld>(Mil.)</fld> <sd>(a)</sd> <def>The watch of a whole army by night, when in danger of surprise or attack.</def> <sd>(b)</sd> <def>An encampment for the night without tents or covering.</def>

<h1>Bivouac</h1> <Xpage=150>

<hw>Biv"ouac</hw>, <tt>v. i.</tt> <wordforms>[<tt>imp. & p. p.</tt> <er>Bivouacked</er> (<?/); <tt>p. pr. & vb. n.</tt> <er>Bivouacking</er>.]</wordforms> <fld>(Mil.)</fld> <sd>(a)</sd> <def>To watch at night or be on guard, as a whole army.</def> <sd>(b)</sd> <def>To encamp for the night without tents or covering.</def>