A B C D E F G H I K L M N O P R S T U V W X Orbital Neoplasms Synonym(s) - Neoplasm, Orbital Definition: Neoplasms of the bony orbit and contents except the eyeball. Broader term(s) Neoplasms Neoplasms by Site Eye Neoplasms Orbital Neoplasms MeSH © U.S. National Library of Medicine®.