/ prɒŋ; NAmE prɔːŋ; prɑːŋ/ noun
1.
each of the two or more long pointed parts of a fork
—picture at fork
2.
each of the separate parts of an attack, argument, etc., that move towards a place, subject, etc. from different positions
3.
-pronged (in adjectives) having the number or type of prongs mentioned :
a two-pronged fork
a three-pronged attack
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WORD ORIGIN
late 15th cent. (denoting a forked implement): perhaps related to Middle Low German prange pinching instrument.