つぼ

Noun

 * 1)  a unit of areal measure, roughly 3.3m2 or 35.5ft2, equivalent to the area of two tatami mats.
 * 2)  archaic reading for modern 粒 (つぶ, tsubu), a grain, drop, or pill of something.
 * 3)  a basin; a vessel or bottle; a pressure point in acupressure or acupuncture.