ஆதிசேஷன்
aathisaeshan
அனந்தன். A mythological thousand-headed serpent who supports the earth on his hoods and on whom Viṣṇu reclines;
Tamil Lexicon
--ஆதிசேடன், ''s.'' A fabulous serpent supposed to support the earth on his head--king of the ser pents, அனந்தன். He is said to have existed prior to the creation of the world and to continue to exist after its destruction; [''ex'' சேஷன், who re mains.]
Miron Winslow
āti-cēṣaṉ
n. ādi+.
A mythological thousand-headed serpent who supports the earth on his hoods and on whom Viṣṇu reclines;
அனந்தன்.
DSAL