the.com/nucleophile

means A nucleophile is an electron-rich atom, ion, or molecule that seeks out and bonds with positively charged or electron-poor centers, forming a new chemical bond by donating an electron pair.

from Built from 'nucleus' (Latin nucleus, 'little nut' or 'kernel,' the positively charged core of an atom) plus '-phile' (from Greek philos, 'loving' or 'friend of'). So, literally, a 'nucleus-lover' — a species drawn toward positive charge. The term was coined in the 20th century by chemists, part of a matched pair with 'electrophile' (electron-lover), as organic chemistry developed its vocabulary for describing how electron-rich and electron-poor species attract one another in reactions.