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.

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Definitions of pip from WordNet
pip (n.)
a disease of poultry;
pip (n.)
a minor nonspecific ailment;
pip (n.)
a small hard seed found in some fruits;
pip (n.)
a mark on a die or on a playing card (shape depending on the suit);
Synonyms: spot
pip (n.)
a radar echo displayed so as to show the position of a reflecting surface;
Synonyms: blip / radar target
pip (v.)
kill by firing a missile;
Synonyms: shoot
pip (v.)
hit with a missile from a weapon;
Synonyms: shoot / hit
pip (v.)
defeat thoroughly;
Synonyms: worst / mop up / whip / rack up