IPA: /nɒnˈkrəʊməˌsəʊl/
KK: /nɑnˈkroʊməˌsoʊl/
Not located on or related to a chromosome, often referring to genetic material that is not found within chromosomes.
The study focused on nonchromosomal DNA that plays a role in cellular functions.
Nonchromosomal → It is formed from "non-" (meaning not) and "chromosomal" (from "chromosome" which comes from Greek "chroma" meaning color and "soma" meaning body). The term refers to something that is not related to chromosomes, which are the colored bodies in cells that carry genetic information.
Think of 'non-' meaning not, and 'chromosomal' referring to the colored bodies that carry genetic information. This helps you remember that 'nonchromosomal' means something that is not related to those genetic structures.