眼球|がんきゅうgankyuu[0]heiban (flat)

1. no-adjectiveeyeball

• Synonym目玉めだまNeutralIn daily speech the word for the eyeball; it also means a drawcard or flagship product, as in 「目玉商品」— a use 「眼球」 lacks. 「眼球」 is the medical, formal term.
• SynonymめNeutralThe everyday word for the eye and the most common by far; it also covers eyesight and one's gaze. 「眼球」 refers strictly to the eyeball as an organ.
• Synonym眼まなこNeutralWritten 「眼」, the word leans toward formal prose and can also mean a discerning eye. 「眼球」 remains the medical term for the organ.

Use 「眼球」 for the eyeball in medical or scientific contexts, as in 「眼球運動」. In everyday speech say 「目」 for the eye. 「目玉」 covers the eyeball casually and, figuratively, a headline attraction; written 「眼」 suits formal prose.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 視覚しかく器官きかんの一ひとつ。球形きゅうけいで眼窩がんかにおさまる。目玉めだま。