/mas"teuhr muynd', mah"steuhr-/ , v.t.
1. to plan and direct (a usually complex project or activity), esp. skillfully: Two colonels had masterminded the revolt.
n.
2. a person who originates or is primarily responsible for the execution of a particular idea, project, or the like: the masterminds of company policy.
[ 1710-20; MASTER + MIND ]