gahaṇī : [f.] gestation; digestion.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Gahaṇī (f.) the "seizer," a supposed organ of the body dealing with digestion and gestation. Sama -- vepākiniyā g˚ iyā samannāgata "endowed with good digestion" D ii.177=iii.166. Same phrase at Av Ś i.168, 172. Cp. Vedic graha. B. Psy. 59, 67.
  Gahaṇika in phrase saŋsuddha -- gahaṇika coming from a clean womb, of pure descent, in the enum. of the indispensable good qualities of a brahmin or a noble D i.113, 115, 137 (gahaṇī expl. as kucchi DA i.281); A i.163, iii.154, 223; Sn p. 115. J i.2; duṭṭha -- gahaṇika having a bad digestion Vin i.206.

Pali-English Dictionary, TW Rhys Davids, William Stede,