any gene found in two or more species that can be traced to a common ancestor; specif. one of two homologous genes that is descended from a common ancestor, but which has evolved in a different way; also called orthologous gene
- Orthologous gene
noun See ortholog
orthomechanical or·tho·me·chan·i·cal (ôr’thō-mĭ-kān’ĭ-kəl) adj. Of or relating to a physical orthopedic device such as a brace, a prosthesis, or an orthotic appliance.
orthometer or·thom·e·ter (ôr-thŏm’ĭ-tər) n. An instrument for determining the degree of protrusion or retraction of the eyeballs.
[awr-thoh-muh-lek-yuh-ler] /ˌɔr θoʊ məˈlɛk yə lər/ adjective 1. being or pertaining to the treatment of disease by increasing, decreasing, or otherwise controlling the intake of natural substances, especially vitamins. Compare (def 1). orthomolecular or·tho·mo·lec·u·lar (ôr’thō-mə-lěk’yə-lər) adj. Of, relating to, or being a theory holding that mental diseases or abnormalities result from various chemical imbalances or […]