dirigents

Noun

dirigent (plural dirigents)

1. Something that or someone who directs; a director or guide.
   • The monolignol substrates are held in position by proteins called dirigents (guide proteins).[…]Lignan dirigent proteins are found in the cytoplasm, but similar dirigents have been localized in the cell walls of some plants.2011, Florence Gleason, Raymond Chollet, Plant Biochemistry, page 133
2. (dated) The line of motion of a describent line or surface that in so moving defines a plane or solid figure; a directrix.
   • The straight line in which the vertical polar plane cuts the plane of the circle of contact is called the dirigent. As there are in general two circles of contact, there are two dirigents, and they are parallel to the diretrices.1877, James Booth, A Treatise on Some New Geometrical Methods, page 348

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