[noo-klee-uh-fil-ik, nyoo-]
adjective Chemistry.
of or pertaining to electron contribution in covalent bonding (opposed to electrophilic ).

1930–35; nucleo- + -philic

nucleophile [noo-klee-uh-fahyl, nyoo-] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nucleophilic (ˌnjuːklɪəʊˈfɪlɪk)
chem Compare electrophilic having or involving an affinity for positive charge. Nucleophilic reagents (nucleophiles) are molecules, atoms, and ions that behave as electron donors

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences for nucleophilic
The cysteine thiol group is nucleophilic and easily oxidized.
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