1. Lasting for an hour
   "an hourlong examination"

See also: long

• groundling
• groundmass
• groundnut
• groundnut oil
• groundnut vine
• grounds
• groundsel
• groundsel bush
• groundsel tree
• groundsheet
• groundskeeper
• groundsman
• groundspeed
• groundwater level
• groundwork
• group
• group A
• group AB
• group action
• group Amentiferae
• group B
• group captain
• group Centrospermae
• group discussion
• group dynamics