aṣṭā
Benfey Sanskrit-English Dictionary
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p. 63, col. 1.
aṣṭā aṣṭā, a substitute of
aṣṭan in
the former part of many comp. words,
especially before numerals, e. g. aṣṭā
-daśan, Eighteen.
Monier-Williams Sanskrit-English Dictionary (2nd ed.)
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p. 116, col. 3.
aṣṭā (in
comp. for
aṣṭan)