The pupil is always dilated and insensitive to light.
Her pupils dilated as he neared, her breath quickening.
Asplanchnaceae, plankton, dwellers in small pools, are, however, ovoid, and Trochosphaera is spherical and must owe its floating powers to the low density of the liquid in its enormously dilated bodycavity.
Your pupils are dilated.
Other patients need laser surgery to remove dilated blood vessels.