Hemifacial

Part of speech: adjective

Definitions

1. Relating to, or affecting one side of the face; describing a condition that involves only half of the facial features ; specifically indicating an anatomical or medical phenomenon restricted to one lateral portion of the face
2. Pertaining to one side of the face in terms of structure or function; denoting a medical situation characterized by unilateral facial involvement or asymmetry ; indicating a focus on the left or right facial region in diagnostic or surgical contexts
3. Involving only a single side of the face either in anatomical description or clinical manifestation ; used to describe conditions that exhibit facial asymmetry or localized abnormalities on one half of the face

Etymology: "Hemifacial" is a plain technical formation, built from two parts that each carry a clear meaning. The first part, "hemi-", comes from Greek "hēmi-", meaning "half," and it appears in many medical and scientific terms such as hemisphere and hemiplegia. The second part, "facial," comes from Latin "facies," meaning "face," with the adjective ending added in English. Put together, the word literally describes something belonging to half of the face. The word is used in medicine to describe conditions that affect only one side of the face, such as hemifacial spasm, in which involuntary twitching occurs on one side, or hemifacial microsomia, a developmental condition in which one side of the face is underdeveloped. Its meaning stays close to its parts, so the word needs little explanation once the two elements are known.

Synonyms: unilateral, half-facial, one-sided, asymmetrical, partial