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Related to pinhole pupil: Dilated pupils
an extremely constricted pupil.
Etymology: ME, pyn + hol + L, pupilla, little girl
a very small pupil, which may be a congenital condition, an effect of the use of miotics, or the result of an inflamed iris.
pin·hole pu·pil(pin'hōl pyū'pil)
An extremely constricted pupil.
A pupil of minute size; one excessively constricted; seen after use of miotics, in opium poisoning, and in certain brain disorders.
See also: pupil