The Collaborative International Dictionary
Dilatable
Dilatable \Di*lat"a*ble\, a. [Cf. F. dilatable.] Capable of expansion; that may be dilated; -- opposed to contractible; as, the lungs are dilatable by the force of air; air is dilatable by heat.
Wiktionary
dilatable
a. That can be dilated
Usage examples of "dilatable".
It so happened in this case that the peritoneum was extremely dilatable, and the uterus, with the child inside, made its way into the peritoneal sac.
All night-prowling animals have widely dilatable pupils, and in addition to this they have in the retina a special organ called the tapetum lucidum, the function of which is to reflect to a focus in front of them the relatively few rays of light that enter the widely-dilated pupil and thus enable them the better to see their way.