IPA: /ˈkʌltɪdʒən/
KK: /ˈkʌltɪdʒən/
A type of organism, particularly a cultivated plant, that does not have a known wild version and has been significantly altered through domestication.
The banana is a well-known cultigen that has been cultivated for thousands of years.
Cultigen is formed from "cultus" (meaning cultivated) and "-gen" (meaning to produce or generate). The word refers to a plant that has been cultivated or produced through human intervention.
Think of 'cultivated' ('cultus') plants that are 'produced' ('-gen') by humans — that's what a cultigen is.
No commonly confused words.