Definitions

from The Century Dictionary.

  • Directing; serving to direct: formerly applied, in chemistry, to certain ingredients in prescriptions which were supposed to guide the action of the rest.
  • noun In geometry, the line of motion along which the describent line or surface is carried in the generation of any plane or solid figure; the directrix.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Directing.
  • noun (Geom.) The line of motion along which a describent line or surface is carried in the genesis of any plane or solid figure; a directrix.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geometry The line of motion along which a describent line or surface is carried in the genesis of any plane or solid figure; a directrix.

Etymologies

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