凸
でこ
deko
JLPT N15 strokesKanjiLevel 97 - JLPT N1
Quick answer
凸 is the kanji for "Convex". A common reading is でこ (deko). You can also practice writing it on this page.
Meaning
Convex
Also : Uneven · Protuberant
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Readings
kunでこ/ dekoonとつ/ totsu
kun = Japanese reading · on = Chinese reading
Practice writing
Trace the kanji stroke by stroke with a visual guide.
Stroke Order
5 strokes
Radicals
凸
Example Sentences
凸レンズを使って光を集める。
とつれんずをつかってひかりをあつめる。
We use a convex lens to gather light.
凸凹の道は歩きにくい。
でこぼこのみちはあるきにくい。
The uneven road is difficult to walk on.
Vocabulary using 凸
Grammar to study at this level
- [Noun/Verb dictionary form] + に際して～に際して (ni saishite) - On the occasion of
- [Noun] + をもとに(して)～をもとに (wo moto ni) - Based on
- [Noun/Verb dictionary form] + にあたって～にあたって (ni atatte) - When doing; Upon
- [Verb/Adjective/Noun] + にしろ/にせよ～にしろ／にせよ (ni shiro/ni seyo) - Even if; Regardless of
- [Noun] + をめぐって～をめぐって (wo megutte) - Concerning; Over; Surrounding
Last updated Jul 25, 2026
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