'non-Amoritic' is formed in English from the negative prefix 'non-' (from Latin 'non', meaning 'not') attached to 'Amoritic'. 'Amoritic' itself originates from the name of the ancient people/region 'Amurru' (Akkadian) / 'Amorite' (Latin/English), where the root referred to the Amorite people or their land.

'Amurru' (Akkadian) gave rise to forms referring to the Amorites in Northwest Semitic and later in Classical languages; Late Latin/French yielded 'Amoritus/Amorite' and English adopted 'Amorite'. The adjectival suffix '-ic' produced 'Amoritic', and modern English forms the negated adjective by prefixing 'non-' to produce 'non-Amoritic'.

Initially the root referred specifically to the people or the region ('Amurru' / the Amorites); over time it broadened to denote language, culture, and related features ('Amoritic'), and 'non-Amoritic' now denotes absence of those relations or features.