apidhāna : [nt.] a cover; lid.

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

Apidhāna (nt.) [Vedic apidhāna in same meaning] cover, lid Vin i.203, 204; ii.122. See apidahati.

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

api-dhā́na n. placing upon covering KātyŚr
• a cover, a cloth for covering RV. &c
• a lid BhP
• a bar Kum
• (ī), f. a cover Āp. (cf. pi-dhāna.)

Sanskrit-English Dictionary, by M. Monier William