What's the "een" in Halloween?
1650s, from French capsule "a membranous sac" (16c.), from Latin capsula "small box or chest," diminutive of capsa "box, case, chest" (see case (n.2)). Medicinal sense is 1875; shortened form cap is from 1942. Sense in space capsule is first recorded 1954. As an adjective from 1938. Related: Capsular.
capsule cap·sule (kāp'səl, -sōōl)
A fibrous, membranous, or fatty sheath that encloses an organ or part, such as the sac surrounding the kidney or the fibrous tissues that surround a joint.
A small soluble container, usually made of gelatin, that encloses a dose of an oral medicine or a vitamin.
The thin-walled, spore-containing structure of mosses and related plants.