Invaginated

Part of speech: verb

Definitions

1. A state characterized by the inward folding of a structure to form a pocket-like area
2. This refers to a situation in which an organ or tissue is turned or bent inward, creating a concave shape
3. A condition in which a structure folds inward to create a cavity or pouch is described as being in this state

Etymology: "Invaginated" is the past form of "invaginate," a verb for folding or pushing a tissue inward so that it forms a sheath-like pocket, as when the intestine folds into itself. Its source is the Latin "vagina," which meant "sheath" or "scabbard," the covering for a sword blade. Medieval Latin writers built "invaginare" from that noun, adding the prefix "in-" for "into," so the verb means something like "to put into a sheath." The anatomical sense is the reason the word lives on. Because the female reproductive canal was also called a "vagina" in Latin, the same sheath image eventually supplied an anatomical term there too, which means the root of "invaginate" and the name of that organ are the same word. In medicine, "invagination" is used of the intestine telescoping into itself, a condition that can cause blockage, and the metaphor of a sheath being folded inward carries directly into that clinical use.

Synonyms: folded, enveloped, infolded, wrapped, inserted