球体(きゅうたい)

きゅうたい
noun
sphere; globe; ball-shaped object
mathscience
1. sphere; globe; spherical body
A three-dimensional round shape where every point on the surface is the same distance from the center. Used in mathematics, science, and everyday descriptions.
地球(ちきゅう)は完全(かんぜん)な球体(きゅうたい)ではない。
The Earth is not a perfect sphere.
ガラスの球体(きゅうたい)が光(ひかり)を反射(はんしゃ)している。
A glass sphere is reflecting the light.
球体(きゅうたい)の表面積(ひょうめんせき)は4πr²で求(もと)められる。
The surface area of a sphere can be calculated with 4πr².

The standard term for a sphere in both scientific and everyday contexts. More precise than 丸(まる)い (round), which can apply to flat circles as well.

Forms

球(きゅう) (ball, sphere) + 体(たい) (body, form)

Common collocations

Related geometric terms

Related Words

Related: 立方体(りっぽうたい) (cube)
Related: 円柱(えんちゅう) (cylinder)
Related: 円錐(えんすい) (cone)
general
Added 2026.3.29 20:09 · Revised 2026.9.2 13:01
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