Part 1179

<hw><hw>Blas`to*der*mat"ic</hw> <tt>(?)</tt>, <hw>Blas`to*der"mic</hw> <tt>(?)</tt>,<hw> <tt>a.</tt> <def>Of or pertaining to the blastoderm.</def>

<h1>Blastogenesis</h1> <Xpage=153>

<hw>Blas`to*gen"e*sis</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Gr. <ets><?/</ets> sprout + E. <ets>genesis</ets>.]</ety> <fld>(Biol.)</fld> <def>Multiplication or increase by gemmation or budding.</def>

<h1>Blastoid</h1> <Xpage=153>

<hw>Blas"toid</hw> <tt>(?)</tt>, <tt>n.</tt> <fld>(Zo\'94l.)</fld> <def>One of the Blastoidea.</def>

<h1>Blastoidea</h1> <Xpage=153>

<hw>Blas*toid"e*a</hw> <tt>(?)</tt>, <tt>n. pl.</tt> <ety>[NL., fr. Gr. <ets><?/</ets> sprout + <ets>-oid</ets>.]</ety> <fld>(Zo\'94l.)</fld> <def>One of the divisions of Crinoidea found fossil in paleozoic rocks; pentremites. They are so named on account of their budlike form.</def>

<h1>Blastomere</h1> <Xpage=153>

<hw>Blas"to*mere</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Gr. <ets><?/</ets> sprout + <ets>-mere</ets>.]</ety> <fld>(Biol.)</fld> <def>One of the segments first formed by the division of the ovum.</def>

<i>Balfour.</i>

<h1>Blastophoral, Blastophoric</h1> <Xpage=153>

<hw><hw>Blas`toph"o*ral</hw> <tt>(?)</tt>, <hw>Blas`to*phor"ic</hw> <tt>(?)</tt>,<hw> <tt>a.</tt> <def>Relating to the blastophore.</def>

<h1>Blastophore</h1> <Xpage=153>

<hw>Blas"to*phore</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Gr. <ets><?/</ets> sprout + <ets><?/</ets> to bear.]</ety> <fld>(Biol.)</fld> <def>That portion of the spermatospore which is not converted into spermatoblasts, but carries them.</def>

<h1>Blastopore</h1> <Xpage=153>

<hw>Blas"to*pore</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Gr. <ets><?/</ets> sprout + E. <ets>pore</ets>.]</ety> <fld>(Biol.)</fld> <def>The pore or opening leading into the cavity of invagination, or archenteron.</def> <note>[See <i>Illust</i>. of <er>Invagination</er>.]</note>

<i>Balfour.</i>

<h1>Blastosphere</h1> <Xpage=153>

<hw>Blas"to*sphere</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Gr. <ets><?/</ets> sprout + E. <ets>sphere</ets>.]</ety> <fld>(Biol.)</fld> <def>The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum.</def> <note>[See <i>Illust</i>. of <er>Invagination</er>.]</note>

<h1>Blastostyle</h1> <Xpage=153>

<hw>Blas"to*style</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Gr. <ets><?/</ets> sprout, bud + <ets><?/</ets> a pillar.]</ety> <fld>(Zo\'94l.)</fld> <def>In certain hydroids, an imperfect zooid, whose special function is to produce medusoid buds. See <er>Hydroidea</er>, and <er>Athecata</er>.</def>

<h1>Blast pipe</h1> <Xpage=153>

<hw>Blast" pipe`</hw> <tt>(?)</tt>. <def>The exhaust pipe of a steam engine, or any pipe delivering steam or air, when so constructed as to cause a blast.</def>

<h1>Blastula</h1> <Xpage=153>

<hw>Blas"tu*la</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[NL., dim. of Gr. <ets><?/</ets> a sprout.]</ety> <fld>(Biol.)</fld> <def>That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.</def>

<h1>Blastule</h1> <Xpage=153>

<hw>Blas"tule</hw> <tt>(?)</tt>, <tt>n.</tt> <fld>(Biol.)</fld> <def>Same as <er>Blastula</er>.</def>

<h1>Blasty</h1> <Xpage=153>