rātrO | रात्र्O | rAtrO
rā/trO | रा/त्र्O | ind., at n˚, by n˚; rātrO ṣayanam | रात्र्O षयनम् |, a festival on the 11th day of the first half of the month Āṣāḍha, regarded as the night of the gods, beginning with the summer solstice, when Viṣṇu reposes for four months on the serpent Śeṣa