From spell + -athon. <span class="searchmatch">spellathon</span> (plural <span class="searchmatch">spellathons</span>) (chiefly Australia, New Zealand) A spelling bee held to raise money for charity. 1972, The Educational...
<span class="searchmatch">spellathons</span> plural of <span class="searchmatch">spellathon</span>...
sexathon shopathon skateathon skiathon skipathon snogathon snoozeathon <span class="searchmatch">spellathon</span> spendathon spinathon subathon swimathon talkathon twerkathon vaxathon...