Chromosome 14q deletion is a chromosome abnormality that occurs when there is a missing (deleted) copy of genetic material on the long arm (q) of chromosome 14. The disease is Monarch Disease Ontology term MONDO_0016912 (partial deletion of the long arm of chromosome 14). Also known as: partial deletion of chromosome 14q, partial deletion of the long arm of chromosome type 14, partial monosomy of chromosome 14q, partial monosomy of the long arm of chromosome 14.