महाभारतः mahābhārataḥ - book-1, chapter-90, verse-49

तदस्य
शंतनुत्वम् ॥४९॥

49. tadasya
śaṁtanutvam.

49. tat asya
śaṃtanutvam

49. That is the origin of his name Śaṃtanu (or 'that is his Śaṃtanu-ness').

Words meanings summery:

• तत् (tat) - that (referring to the previous explanation) (that, this)

• अस्य (asya) - his (referring to Śaṃtanu) (his, of him, of this)

• शंतनुत्वम् (śaṁtanutvam) - his quality of being Śaṃtanu (referring to his rejuvenating power) (the state of being Śaṃtanu, Śaṃtanu-ness)

Words meanings and morphology

तत् (tat) - that (referring to the previous explanation) (that, this)

(pronoun)

Nominative, neuter, singular of tad

tad - that, he, she, it

अस्य (asya) - his (referring to Śaṃtanu) (his, of him, of this)

(pronoun)

Genitive, masculine, singular of idam

idam - this, he, she, it

genitive singular of 'idam'

शंतनुत्वम् (śaṁtanutvam) - his quality of being Śaṃtanu (referring to his rejuvenating power) (the state of being Śaṃtanu, Śaṃtanu-ness)

(noun)

Nominative, neuter, singular of śaṃtanutva

śaṁtanutva - the state or quality of being Śaṃtanu

Compound type : tatpurusha (śaṃtanu+tva)

• śaṃtanu – name of a king
  proper noun (masculine)
• tva – suffix denoting abstract quality, -ness, -hood
  indeclinable (neuter)
  abstract noun suffix