v. Simple past tense and past participle of dilate.
the GNU version of the Collaborative International Dictionary of English
adj. Expanded; enlarged.
adj. Widening into a lamina or into lateral winglike appendages.
adj. Having the margin wide and spreading.
The Century Dictionary and Cyclopedia
Expanded; extended; enlarged.
Word Usage
"The heart with noncompaction can be dilated with decreased pumping function as in dilated cardiomyopathy (see above) or can have normal pumping function."