'Pupil' definitions:

Definition of 'pupil'

noun

A learner who is enrolled in an educational institution [syn: student, pupil, educatee]

noun

The contractile aperture in the center of the iris of the eye; resembles a large black dot

noun

A young person attending school (up through senior high school) [syn: schoolchild, school-age child, pupil]

From: GCIDE

Pupil \Pu"pil\, n. [F. pupille, n. fem., L. pupilla the pupil of the eye, originally dim. of pupa a girl. See Puppet, and cf. Pupil a scholar.] (Anat.) The aperture in the iris; the sight, apple, or black of the eye. See the Note under Eye, and Iris. [1913 Webster]
Pin-hole pupil (Med.), the pupil of the eye when so contracted (as it sometimes is in typhus, or opium poisoning) as to resemble a pin hole. --Dunglison. [1913 Webster]

From: GCIDE

Pupil \Pu"pil\, n. [F. pupille, n. masc. & fem., L. pupillus, pupilla, dim. of pupus boy, pupa girl. See Puppet, and cf. Pupil of the eye.]
1. A youth or scholar of either sex under the care of an instructor or tutor. [1913 Webster]
Too far in years to be a pupil now. --Shak. [1913 Webster]
Tutors should behave reverently before their pupils. --L'Estrange. [1913 Webster]
2. A person under a guardian; a ward. --Dryden. [1913 Webster]
3. (Civil Law) A boy or a girl under the age of puberty, that is, under fourteen if a male, and under twelve if a female. [1913 Webster]
Syn: Learner; disciple; tyro. -- See Scholar. [1913 Webster]