Most smooth and lustrous

WordNet Word definitions in WordNet
See silky

Wiktionary Word definitions in Wiktionary
a. (en-superlativesilky)

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Silky \Silk"y\, a. [Compar. Silkier ; superl. Silkiest .] Of or pertaining to silk; made of, or resembling, silk; silken; silklike; as, a silky luster. Hence, soft and smooth; as, silky wine. Covered with soft hairs pressed close to the surface, as a leaf; ...