pre-rollpre-roll /ˈpriː rəʊl $ -roʊl/ noun [countable] 
technical an advertisement that is shown before a video on the Internet
technical an advertisement that is shown before a video on the Internet- school age
- school board
- schoolbook
- schoolboy
- School Certificate
- schoolchild
- schoolday
- school district
- school friend
- schoolgirl
- school governor
- schoolhouse
- schooling
- schoolkid
- school-leaver
- schoolmarm
- schoolmaster
- schoolmate
- schoolmistress
- school night
- schoolroom
- school run
- schoolteacher
- school tie
- schoolwork