noun
bottom rim of a cup or bowl
Refers specifically to the raised circular foot or base of ceramic vessels. Often contrasted with 糸底 (いとぞこ), which is the flat bottom surface inside that rim.
See also: 糸底
この茶碗は糸尻が高くて安定している。
This tea bowl has a high foot rim and is stable.
古い器の糸尻には、ろくろの跡が残っていることがある。
On the foot rim of old vessels, marks from the potter's wheel sometimes remain.
糸底 refers to the flat bottom surface inside the foot rim, while 糸尻 is the raised rim itself.
Compound of 糸 (いと, 'thread') and 尻 (しり, 'bottom, end'). The exact origin is uncertain, but it likely refers to the thin, thread-like line of the foot rim on pottery.