Lewis & Short

ĕrănus, i, m., = ἔραϝος, a fund contributed for mutual protection against want: concessum est eranum haberesi tali conlatione non ad turbas et ad inlicitos coetus, sed ad sustinendam tenuiorum inopiam utuntur, Plin. Ep. 10, 93; cf. ib. 92; Tert. Apol. 39.