noun, masculine/mɛtʁ/plural: maîtres
master; Military rank in the Navy, usually equivalent to the rank of sergent-chef in the Army, or petty officer first class in the United States Navy; leader; teacher (in a primary school); holder of a master's degree
Inherited from Middle French maistre, from Old French maistre, from Latin magistrum. Doublet of maestro, borrowed from Italian, magister, borrowed from Latin, and master, borrowed from English.