chromosomal aberration(n = noun.state) chromosomal anomaly, chromosonal disorder, chrosomal abnormality - any change in the normal structure or number of chromosomes; often results in physical or mental abnormalities;
is a kind of aberrance, aberrancy, aberration, deviance
has particulars: monosomy, trisomy, sex-linked disorder

aberration, chromatic aberration, chromosomal, chromosomal anomaly, chromosomal mutation, optical aberration, spherical aberration