Etymology
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medial (adj.)

1560s, "pertaining to a mathematical mean," from Late Latin medialis "of the middle," from Latin medius "in the middle, between; from the middle," as a noun (medium) "the middle;" from PIE root *medhyo- "middle." Meaning "occupying a middle position, existing between two extremities or extremes" is attested from 1721.

medial (n.)

"a medial letter," 1776, from medial (adj.).

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Definitions of medial

medial (adj.)
relating to or situated in or extending toward the middle;
Synonyms: median
medial (adj.)
dividing an animal into right and left halves;
Synonyms: median
From wordnet.princeton.edu