Dilate
WordNet
verb
(1) Become wider
"His pupils were dilated"
WiktionaryText
Etymology
From Old French dilater, from Latin dilatare ‘spread out’, from di- + latus ‘wide’.
Verb
- To enlarge; to make bigger.
- The eye doctor put drops in my eye to dilate the pupil so he could see the nerve better.
- To become wider or larger; to expand.