The word "somatodidymus" is complex and difficult to spell. It refers to a developmental abnormality where a person is born with only one testicle. The word is pronounced "soh-muh-toh-did-uh-muhs" with emphasis on the second syllable. The unique combination of Greek roots "soma" meaning body and "didymos" meaning twins adds to its complexity. While uncommon, the correct spelling is important in medical documentation and communication.
A twin monster with fused bodies.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.