Jisho

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Noun
1. ball (for sport, games, etc.)
Noun
2. kemari; type of football played by courtiers in ancient JapanOnly applies to 鞠, Only applies to 毬, See also 蹴鞠
Wikipedia definition
3. Ball (mathematics)In mathematics, a ball is the space inside a sphere. It may be a closed ball or an open ball (excluding them). These concepts are defined not only in three-dimensional Euclidean space but also for lower and higher dimensions, and for metric spaces in general. A ball in the Euclidean plane, for example, is the same thing as a disk, the area bounded by a circle.
Read “Ball (mathematics)” on English Wikipedia
Read “球” on Japanese Wikipedia
Read “Ball (mathematics)” on DBpedia
Other forms
毬 【まり】球 【まり】
Notes
球: Irregular kanji usage.

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