[prawng, prong]
one of the pointed tines of a fork.
any pointed, projecting part, as of an antler.
a branch of a stream.
Jewelry. a tapering metal projection, usually heavier than a claw, rising from the base of a jewelry setting and used to hold a stone in position as needed. Compare claw ( def 7 ).
verb (used with object)
to pierce or stab with or as if with a prong.
to supply with prongs.

1400–50; late Middle English pronge, prange pain, affliction, pointed instrument; akin to Old Swedish prang gorge, narrow street, Middle Low German prange stake, prangen to press, Gothic anaprangan to oppress

2. hook, tooth, spur. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prong (prɒŋ)
1.  a sharply pointed end of an instrument, such as on a fork
2.  any pointed projecting part
3.  (tr) to prick or spear with or as if with a prong
[C15: related to Middle Low German prange a stake, Gothic anaprangan to afflict]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1492, from Anglo-Latin pronga "prong, pointed tool," of unknown origin, perhaps related to M.L.G. prange "stick, restraining device," prangen "to press, pinch." See also prod, which may be related. Prong-horned antelope is from 1815.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Three-prong grounded extensions cords must be used with tools and appliances
  that have three prongs.
If you are considering a multi-prong travel adapter, be sure to check the
  countries that are covered.
Three-prong extension cords are the only ones to use.
Describes a two-prong inservice program to be led by counselors.
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