the.com/ampoule

a glass bubble that swallows your medicine then snaps its own neck to give it back

means A small sealed glass container holding a single dose of liquid medicine, snapped open when needed.

from From Latin 'ampulla,' a small rounded flask or bottle — a diminutive of 'amphora,' the two-handled jar of the ancient Mediterranean. The word traveled through French as 'ampoule,' keeping its sense of a little swollen vessel; the same Latin root also swelled into English 'ampulla,' a term for sacred oil flasks and, in anatomy, the bulging part of a duct.

sealed by fire
Flame melts the glass tip into an airtight twist
snap point
A painted dot marks where to break it
name origin
From Latin ampulla, a round flask
royal cousin
France's coronation oil came from a sacred ampoule
no air allowed
Glass beats plastic for keeping contents pristine
for instance

viala and wittig ampule — 1893 french glass containers that revolutionized sterile pharmaceutical packaging by sealing medicines under heat

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