<span class="searchmatch">Cyclopentadiens</span> genitive singular of <span class="searchmatch">Cyclopentadien</span>...
<span class="searchmatch">Cyclopentadien</span> n (strong, genitive <span class="searchmatch">Cyclopentadiens</span>, no plural) (organic chemistry) cyclopentadiene Declension of <span class="searchmatch">Cyclopentadien</span> [sg-only, neuter, strong]...