aharvyatyāsam
Monier-Williams Sanskrit-English Dictionary (2nd ed.)
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p. 124, col. 3.
ahar—vyatyāsam ind. so that the order of the days is reversed,
KātyŚr.
Böhtlingk Sanskrit-Wörterbuch in kürzerer Fassung
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vol. 1,
p. 155, col. 3.
aharvyatyāsam Adv. mit Umstellung der Tage KĀTY. ŚR. 16,6,5.