The word for the opening in the center of the iris is ______________, and its plural form is ______________.

Question

Quizplus · Accepted Answer

The opening in the center of the iris that allows light to reach the lens is called the pupil; the plural form is pupillae. Pupil (also known as pupilla) is derived from the Latin meaning pupil. The rule for changing a singular word ending in a into a plural is to keep the a and add an e.

The Word for the Opening in the Center of the Iris