1. rarenter — de Vaan
rarenter 'seldom1 (Andr.+), raritudo 'looseness, openness1 (Lucr.+), rarescere 'to thin out, open out' (Lucr.+), rarefacere 'to make less solid' (Lucr.+). Antonym of densus. EM state that Lat. rarenter was formed on the example of frequenter. Rams has been connected with PIE *fj2erH~ 'to disappear, perish1 by EM, but this is not obvious semantically. Others connect Gr. έρημος 'lonely'. Schrijver is critical of all … — [de Vaan, s.v. rarenter, p. 528]