trimensional

It is owing to this fundamental fact that the two retinal images of the same trimensional object are slightly different from each other, and this difference is technically called lateral disparity.

1920, Hubert Gruender, An Introductory Course in Experimental Psychology: […], volume I, Chicago, I.L.: Loyola University Press, page 175

Sutt indicated the trimensional star-map on the table. He adjusted the controls and a cluster of some half-dozen stellar systems blazed red.

1944 August, Isaac Asimov, “The Big and the Little”, in Astounding Science Fiction, volume XXXIII, number 6, page 8

Photographic aggregates, as stated previously, can be made which produce single images with all the attributes of stereoscopic vision and which the writer termed "trimensional images." […] Trimensional pictures, the writer is certain, will replace the present geometric pictures as a matter of course. The trimensional perspective will lend a touch of amazing reality to photographs and reproductions of any and all kinds whatsoever.

1949 August, Theodore Nakken, “The Great Enigma: The Stereoscopic Perspective”, in International Projectionist, volume 24, number 8, New York, N.Y.: International Projectionist Publishing Co., Inc., →OCLC, page 25

Haskell turned to the captain's desk, studied the trimensional photograph of an Ermesian native. A big creature—over seven feet tall—and heavy, with thick, short legs, hairy torso, long muscular arms terminating in broad, flat hands with multi-jointed fingers tipped with retractile, vermilion-dyed claws.

1950 August, Bernard I. Kahn, “A Pinch of Culture”, in Astounding Science Fiction, volume XLV, page 90, column 1

Since Sam had another son who was about three years old, he was interested in the quality of children's fare on television. He could see that my trimensional animation process would be perfect for children's films.

1986, Art Clokey, “Foreward”, in Gumby: The Authorized Biography of the World's Favorite Clayboy, New York, N.Y.: Harmony Books, →ISBN, page 2, column 1