nucleophilic

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

Origin:
1930–35; nucleo- + -philic

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

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Example sentences for nucleophilic
The cysteine thiol group is nucleophilic and easily oxidized.
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