What does medial mean?
Medial is an adjective meaning situated in or relating to the middle. Its most important technical use is in anatomy, where medial describes a part of the body that lies closer to the central midline than to the outside. For example, the medial collateral ligament of the knee lies on the inner side of the joint and helps resist movement in one direction. The opposite anatomical term is lateral. In general writing, medial can apply more broadly to anything central, although it sounds formal compared with middle, central, and inner. The word is especially useful in medicine, biology, and descriptive anatomy because it expresses a precise spatial relationship without relying on potentially ambiguous left-and-right terms.
adjectiveSituated in or relating to the middle of something. In anatomy, it means nearer to the body's midline, as opposed to lateral.
- Relating to or situated in the middle of something.
- In anatomy, situated nearer to the midline of the body, as opposed to lateral.
"The medial ligament of the knee helps stabilize the joint."
"The medial surface of the tibia articulates with the femur."
"The medial part of the garden receives the least direct sunlight."
Your body has a medial map: structures named medial lie closer to the centre line, while their lateral counterparts lie farther out.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does medial come from?
Medial comes through English from Latin medialis, meaning “of the middle.” The underlying Latin root medius means “middle” or “middlemost” and also supplies the source of related words such as median, immediate, and intermediate. The English adjective developed in the Renaissance period in medical and anatomical usage, where it became established as the counterpart to lateral.
Related word forms
How medial is actually used
In anatomy, medial is the standard opposite of lateral. Outside medical and anatomical contexts, it is formal and less common than middle, central, or inner.
Easily confused with medial
Medial means relating to the middle or an anatomical midline, whereas medical means relating to medicine or healthcare.
Medial describes a position toward the middle, while median often describes the central value in a statistical distribution or the central line of a body.