(common “Jōyō” kanji, shinjitai kanji, kyūjitai form 罐)
- pot; can
- tin can
- jar radical (no. 121)
Originally from Dutch kan (“cylindrical metallic container”), with additional influence from English can (“cylindrical metallic container”). The kanji is an example of ateji (当て字).
缶 (hiragana かん, rōmaji kan)
- a can, a tin
From Old Japanese kama, signifying a container for high heat and referring variously to a hearth, oven, pot, kettle.
Some linguists derive this possibly from Proto-Altaic *kumba, or perhaps as a derivative of Proto-Indo-European *kumbʰo- (whence Sanskrit कुम्भ (kumbhá)), possibly through Indo-Iranian.
缶 (hiragana かま, rōmaji kama)
- a boiler, as for a steam engine
For the boiler sense, this term kama is most often spelled using the kanji 缶.
缶 • (bu) (hangeul 부, revised bu, McCune–Reischauer pu, Yale pu)
장군 부 [janggun bu]
- an earthern vessel that bulges in the middle and has a narrow mouth
- refers to one of many types of the double-headed drums with a narrow waist in the middle
- 洋甁, a glazed pot bulging in the middle with a narrow mouth
- volume, capacity (=4斛) 
- rad. 121