- threeD⇄3-D orthree-D, adjective, noun.
(Informal.) - threeD⇄adj. three-dimensional; stereoscopic.
Ex. ... a 3-D microscope which magnifies clearly and exactly the characteristics of blood cells (Newsweek). - threeD⇄noun 1. a three-dimensional form.
Ex. to see an image in 3-D.
2. a photographic or optical system or process that produces three-dimensional images.