dirigent

/D ER1 AH0 JH AH0 N T/
noun
  1. 1

    (now chiefly biochemistry) Something that or someone who directs; a director or guide.

  2. 2

    (dated, geometry) The line of motion of a describent line or surface that in so moving defines a plane or solid figure; a directrix.

adjective
  1. 1

    That directs.