<synset id="n13891735" type="n">
<lex_filenum>25<lex_filenum/>
<word lex_id="0">angle of extinction<word/>
<word lex_id="0">extinction angle<word/>
<pointer refs="n13887509">Hypernym<pointer/>
<def>the angle from its axis that a crystal must be rotated before appearing maximally dark when viewed in polarized light<def/>
<synset/>