aṉṟil
s. the name of a bird, Hindu nightingale, spoken of as a standard of constancy in love; 2. the 19th. lunar asterism, மூலநக்ஷத்திரம்.
Miron Winslow - A Comprehensive Tamil and English Dictionary
அன்றில்
aṉṟil
s. The nightingale of In dia, much celebrated by poets for attach ment to its mate, which it is said never to leave nor long to survive, ஓர்புள்; [exஅ ன்று, without, etஇல், not.] 2. The nineteenth lunar asterism, மூலநாள். (p.)