Portuguese atolar

← Breton toull (cognate)

← Proto-Celtic *tullon (derived)

← Proto-Celtic *tullos (mention)

← Welsh twll (cognate)

← Spanish atollar (derived)

← Spanish tollo (mention)

← Proto-Indo-European *(s)tew- (derived)

← Old Irish toll (cognate)

→ Galician atolar (cognate)

→ Portuguese atoleiro (suffix)