anirākṛtin
Monier-Williams Sanskrit-English Dictionary (2nd ed.)
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p. 1311, col. 2.
anir—°ākṛtin mfn. one who does not forget what he has learned,
ĀśvŚr.
Schmidt Nachträge zum Sanskrit-Wörterbuch
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p. 34, col. 2.
anirākṛtin Adj. der das Gelernte nicht vergessen hat, Āśv. Śr. 8, 14, 1.