A leader or supervisor of a cub scout organization or group.
From cub (young animal, or a member of cub scouts) + master (a leader/teacher). Modern compound from early 20th century scouting movement.
The word 'cubmaster' shows how institutions create their own vocabulary—scouting organizations invented this word in the 1920s and it became official, teaching us that institutional language happens faster than we realize.
Complete word intelligence in one call. Free tier — 50 lookups/day.