9 letters · 11 points in Scrabble
noun transparent or semitransparent adhesive tape (trade names Scotch tape and Sellotape) used for sealing or attaching or mending
verb fasten or attach with sellotape
originFrom genericized trademark Sellotape, from cello(phane) + tape. The spelling with S- was to avoid an existing trademark on the word Cellophane itself.
Etymology from Wiktionary, CC BY-SA 3.0