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 (dī-lāt′, dī′lāt′)
v. di·lat·ed, di·lat·ing, di·lates
To make wider or larger; cause to expand.
1. To become wider or larger; expand.
2. To speak or write at great length on a subject; expatiate.

[Middle English dilaten, from Old French dilater, from Latin dīlātāre, to enlarge : dī-, dis-, apart; see dis- + lātus, wide.]

di·lat′a·bil′i·ty n.
di·lat′a·ble adj.
di·lat′a·bly adv.
di·la′tive adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
There were some men's eyes that dilated in the darkness and shone like stars or like cats' eyes.
He seemed to see the fat Kentish fields with their stately elms; and his nostrils dilated with the scent of the air; it is laden with the salt of the North Sea, and that makes it keen and sharp.
Michael sat on his haunches, the length of his lower jaw resting on Daughtry's knee, the while his eyes dilated, contracted and glowed, his ears ever pricking and repricking to listen, his stump tail thumping ecstatically on the floor.
Vronsky patted her strong neck, straightened over her sharp withers a stray lock of her mane that had fallen on the other side, and moved his face near her dilated nostrils, transparent as a bat's wing.
But as soon as two drops of blood have thus passed, one into each of the cavities, these drops which cannot but be very large, because the orifices through which they pass are wide, and the vessels from which they come full of blood, are immediately rarefied, and dilated by the heat they meet with.
She, however, having groped in dark cupboards, must have had her pupils sufficiently dilated to have seen that I had my hat on my head.
But when I ventured at last to look at her face I saw her flushed, her teeth clenched - it was visible - her nostrils dilated, and in her narrow, level-glancing eyes a look of inward and frightened ecstasy.
But, doubtless, this noble savage fed strong and drank deep of the abounding element of air; and through his dilated nostrils snuffed in the sublime life of the worlds.
But while memory lane plays a big part in Dilated Peoples' latest work, they haven't lost their world view which appeals to any listener.
(1) In a case-control study of 325 nulliparous women who delivered in a Colorado hospital in 1998-2001, five factors that were known within two hours of admission were independently associated with the risk of cesarean: A woman's likelihood of having a cesarean increased with her weight (odds ratio, 1.02) and with gestational age (1.1), and was sharply elevated if she had preeclampsia (5.8); the more the cervix dilated and the more progress the fetus made along the birth canal in two hours, the lower the likelihood of this outcome (0.5 and 0.6, respectively).
On closer inspection, however, she found that vessels that had initially been dilated became constricted, and those that had been constricted were dilated.
Along with Joachim Schmitt from Harvard Univ., Christine and Jonathan Seidman say that the finding could lead to targeted treatment for dilated cardiomyopathy, a disorder that causes the heart to become enlarged to the point where it can no longer pump blood efficiently.