Sentence:  No foe to man / Lurks in the ſerpent now: the mother ſees, / And ſmiles to ſee, her infant's playful hand / Stretch'd forth to dally with the creſted worm, / To ſtroke his azure neck, or to receive / The <WSD>lambent</WSD> homage of his arrowy tongue. 
Meaning of the word marked with <WSD> tags:  Brushing or flickering gently over a surface.