double balloon; bulb with reservoir
Technical term for a bulb or balloon with two connected chambers, used in laboratory equipment, medical devices, or similar apparatus.
In the experiment, we used a double balloon to aspirate the reagent.
Standard kanji spelling for this technical term.
Variant using numeral ２; seen in some technical contexts.
Compound of 二 (two), 連 (connect), and 球 (ball/sphere). The exact historical derivation is uncertain; the term likely arose in technical contexts to describe a bulb with two connected chambers.