small teapot; kyusu
A small Japanese teapot with a side handle, used for brewing green tea. Distinct from Western-style teapots.
I brew tea with a kyusu.
この急須は急須のふたが割れてしまった。
The lid of this kyusu has cracked.
やかん is used to boil water itself, while 急須 is the small teapot used to steep and pour tea from already-boiled water.
spout of a teapot
Standard kanji spelling for a small Japanese teapot.
Kana spelling is common in everyday writing, especially when the kanji is not needed.
The word 急須 originally referred to a vessel for heating water or sake in China. In Japan, it came to denote a small teapot for brewing tea. The kanji 急 (quick) and 須 (necessary) are ateji, chosen for their sounds rather than their meanings.