A type of yoni (uterus);
the yoni having a shape like the convex back of a tortoise; it is the best kind of uterus and found only in mother of Tīrthankaras (ford-founders) Cakravartīes (universal sovereigns), Baldevas (universal personage, possessed of half the strength of Vāsudeva)- Vāsudevas (semi-universal sovereigns)).
kūrmmaḥ- kacchapaḥ tadvadunnatā kūrmmonnatā.
(Sthā 3.103 Vṛ Pa 116)
kummuṇṇayā ṇaṃ joṇī uttamapurisamāūnam kummunnayāte nam jonīe tivihā uttamapurisā gabbham vakkamamti tamjahā- arahamtā, cakkavattī, baladevavāsudevā.
(Sthā 3.103)