Trubachyov, Oleg, editor (1977), “*<span class="searchmatch">čerslo</span>”, in Этимологический словарь славянских языков [Etymological dictionary of <span class="searchmatch">Slavic</span> languages] (in Russian), numbers...
*dolto <span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span> terms suffixed with *-slo Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/<span class="searchmatch">čerslo</span> Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/čislo Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/gъslo...
Slovene: črez Possibly related to the preposition above, to *<span class="searchmatch">čerslo</span> (“thighs”), and to <span class="searchmatch">Proto</span>-Celtic *krissus (“belt”). *čersъ m leather belt with purse...
*čerťa *čьrkati, *čьrkačь *čьrtъ *čьrxati, *čьrxlja, *čьrslь *kъrčiti *<span class="searchmatch">čerslo</span> *čьrstvъ *čьrta *čьrtati *čьrtelь (possibly) *čьrtežь *čьrtiti *čersъ (“through”)...
while the first form occurs in languages that do not (e.g. Russian). *<span class="searchmatch">čerslo</span> (“loin”) *čersti (“to carve, slash”) *čersъ, *čerzъ (“over, through”) *čьrkati...