PC

*ˁapˁap- - part of the eye (Kogan 2015: 285)

For possible non-reduplicated cognate cf. Arb. ˁafāˀ- ‘a whiteness upon the black of the eye’

Ugaritic
ˁpˁp - pupil (of eye) (DUL 173)
Hebrew
ˁapˁappayim - eye-lashes; eyes (HALOT 861)