masculine gender (in fine compositi or 'at the end of a compound' f(आ).) Equivalent toअव-तंस, a garland, ring-shaped ornament, crest (also that the rest of a word is to be suppliedसक) Ka1v. Chandom.
Source: Monier-Williams
Macdonell
A. A. Macdonell, A Practical Sanskrit Dictionary
वतंसvataṃsa[[a]va-tamsa ] m. chaplet; ring-shaped ornament.