Pip
late Middle English (denoting a variety of apple): abbreviation of pippin (the current sense dates from the late 18th century).
wiktionary
From Middle English pippe, from Middle Dutch pip, from post-classical Latin pipita, from Latin pītuīta(“mucus, phlegm, head cold”).
Apparently representing a shortened form of pippin, from Middle English pipin, from Old French pepin(“a seed”) (French pépin).
Origin uncertain, perhaps related to Etymology 2, above.
Imitative.
Imitative.
Abbreviation of percentage in point.
etymonline
pip (n.1)
1797, "seed of an apple (or orange)," a 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").
pip (n.2)
"disease of poultry consisting of a secretion of thick mucus which forms a white scale around the tongue," late 14c., pippe, probably from Middle Dutch pippe "mucus," from West Germanic *pipit (source also of East Frisian pip, Middle High German pfipfiz, German Pips), an early borrowing from Vulgar Latin *pippita, an unexplained alteration of Latin pituita "phlegm" (see pituitary).
pip (n.3)
"one of the spots on a playing card, dice, etc.," c. 1600, peep, of unknown origin. Because of the original form and difference of dates, it is now not considered to be from pip (n.1). Related: Pips.
