In-sti-gate, cynhyrfu, annog
In-sti-tute, egwyddor; gosodedigaeth: gosod, sefydlu; addysgu
In-struc-tion, addysg, hyfforddiad
In-stru-ment, peiriant, offeryn
In-su-late, ynysu
In-sult-ing, diystyrllyd, gwatwarus
In-sur-ance, diogeliad, digollediad
In-sur-gent, gwrthryfelwr
In-te-ger, cyfanrif, cyfangorff
In-te-gral, symawl, cyfan