Atypia

Part of speech: noun

Definitions

1. A condition characterized by cellular irregularities that lack the expected morphological traits found in healthy tissue
2. The occurrence of cellular abnormalities where the affected cells deviate from the typical characteristics associated with normal function
3. A pathological state marked by deviations in cellular structure that differ from the standard features normally seen in healthy cells

Etymology: "Atypia" is a modern scientific coinage, built in New Latin from three pieces: the Greek prefix "a-", meaning "not" or "without", the Latin "typus" (from Greek "typos", a blow or impression, later a model or form), and the suffix "-ia", which turns a description into a noun denoting a condition. Put together, it names a state of not having the typical form. The "type" in the root is the same word that gives English "type" and "typical", so the term sits within a family of words all tied to the idea of a stamped pattern. In pathology, the word is used for cells that have lost the regular shape and behaviour expected of their tissue, which is why it is paired with the word "normal" in medical descriptions. Its place in medicine is a product of the nineteenth and twentieth centuries, when scientists needed precise names for cellular changes that were visible under the microscope.