Synonyms of the word 
FLATTENED → PLANAR - TWO-DIMENSIONAL
flattened
- adj. Made flat by something.
- v. simple past tense and past participle of flatten.
planar
- adj. Of or pertaining to a plane.
- adj. Flat, two-dimensional.
- adj. (graph theory, of a graph) Able to be embedded in the plane with no edges intersecting.
- adj. (transistor chip, semiconductor devices) Having a flat profile, not etched into a mesa.
two-dimensional
- adj. Existing in two dimensions.
- adj. Not creating the illusion of depth.
If you are interested in words, visit the following sites :
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- 1word.ws/flattened to play with words, suffixs, prefixs, etc.