penta- + thionic + <span class="searchmatch">acid</span>, since it contains five atoms of sulphur. <span class="searchmatch">pentathionic</span> <span class="searchmatch">acid</span> (uncountable) (inorganic chemistry) The dibasic <span class="searchmatch">acid</span> HSO3-S3-SO3H pentathionate...
pentathionate (plural pentathionates) (inorganic chemistry) Any salt of <span class="searchmatch">pentathionic</span> <span class="searchmatch">acid</span>...
IPA(key): /a.sid pɛ̃.ta.tjɔ.nik/ acide pentathionique m (uncountable) (inorganic chemistry) <span class="searchmatch">pentathionic</span> <span class="searchmatch">acid</span>...