American Heritage Dictionary
(3)
Century Dictionary
(12)
GNU Webster's 1913
WordNet
(2)
Elsewhere on the web
Grooves are milled recesses in workpieces which may have various geometrical shapes (prismatic, rotationally symmetrical) and sizes.— 4. Milling of grooves
The workpiece may have a prismatic or rotationally symmetrical shape.— 3. Preparation of milling grooves, elongated slots and break-throughs
Each module is made up of what is known as a prismatic cell— gizmag Emerging Technology Magazine
You can't explain something like evaporation or the prismatic effect that causes a rainbow.— CNN Transcript Dec 10, 2001
Prismatic has been looked up 152 times, favorited twice, listed 24 times, and commented on twice.

American Heritage Dictionary (1)
Century Dictionary (1)
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You can expect to see this word about twice a year.
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