pip
n.
1
"seed of an apple," 1797, shortened form of pipin "seed of a fleshy fruit" (early 14c.), from Old French pepin (13c.), probably from a root *pipp-, expressing smallness (compare Italian pippolo, Spanish pepita "seed, kernel").
2
"disease of birds," late 14c., probably from Middle Dutch pippe "mucus," from West Germanic *pipit (cognates: East Frisian pip, Middle High German pfipfiz, German Pips), an early borrowing from Vulgar Latin *pippita, unexplained alteration of Latin pituita "phlegm" (see pituitary).
3
"spot on a playing card, etc." c.1600, peep, of unknown origin. Because of the original form, it is not considered as connected to pip (n.1). Related: Pips.