| of or pertaining to electron contribution in covalent bonding (opposed to electrophilic ). |
nucleophile nu·cle·o·phile (n&oomacr;'klē-ə-fīl', ny&oomacr;'-) or nu·cle·o·phil (-fĭl')
n.
A chemical compound or group that is attracted to nuclei and tends to donate or share electrons.