rima(n = noun.body) - a narrow elongated opening or fissure between two symmetrical parts;
is a kind of opening, orifice, porta
has particulars: mouth, oral cavity, oral fissure, rima oris, pudendal cleavage, pudendal cleft, pudendal slit, rima pudendi, rima vulvae, urogenital cleft, vulvar slit, glottis vera, rima glottidis, rima vocalis, true glottis, false glottis, glottis spuria, rima respiratoria, rima vestibuli

   A narrow and elongated aperture; a cleft; a fissure. [1913 Webster]

ottava rima, rima glottidis, rima oris, rima pudendi, rima respiratoria, rima vestibuli, rima vocalis, rima vulvae, terza rima