dilate

The eye doctor put drops in my eye to dilate the pupil so he could see the nerve better.

His heart dilates and glories in his strength.

Do me the favour to dilate at full / What hath befallen of them and thee till now.

An experimenter in New York has recently advocated what he is pleased to call temporary forcible dilatation of the trachea in the treatment of membranous croup, his idea being to introduce into the trachea a dilator and to forcibly dilate, every few hours if need be, and he reports favorable results.