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pip 1 (pĭp)
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n.
The small seed of a fruit, as that of an apple or orange.

[Short for PIPPIN.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 
pip 2 (pĭp)
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tr.v. pipped, pip·ping, pips
Chiefly British
1. To wound or kill with a bullet.
2. To defeat.
3. To blackball.

[Possibly from PIP3.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 
pip 3 (pĭp)
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n.
1. Games
a. A dot indicating a unit of numerical value on dice or dominoes.
b. A mark indicating the suit or numerical value of a playing card.
2. A spot or speck.
3. A rootstock of certain flowering plants, especially the lily of the valley.
4. Any of the small segments that make up the surface of a pineapple.
5. Informal A shoulder insignia indicating the rank of certain officers, as in the British Army.
6. See blip.

[Origin unknown.]
(click for a larger image)
pip3
pips on a gaming die (top) and on a domino (bottom)

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 
pip 4 (pĭp)
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v. pipped, pip·ping, pips
v.tr.
To break through (the shell) in hatching. Used chiefly of birds.
v.intr.
To peep or chirp.
n.
A short, high-pitched radio signal.

[Variant of PEEP1 and PEEP2.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 
pip 5 (pĭp)
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n.
1. A disease of birds, characterized by a thick mucous discharge that forms a crust in the mouth and throat.
2. Slang A minor unspecified human ailment.

[Middle English pippe, from Middle Dutch, phlegm, pip, from Medieval Latin *pippīta, alteration of Latin pītuīta; see peiə- in the Appendix of Indo-European roots.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.