Английский Этимологический словарь - pupil (1)

- "student," 14c., originally "orphan child, ward," from L. pupillus (fem. pupilla) "orphan, ward, minor," dim. of pupus "boy" (fem. pupa "girl"), probably related to puer "child," probably from PIE *pup-, from base *pu- "to swell, inflate." Meaning "disciple, student" first recorded 1563.