凹おう形けい

also: おうがた

お

う

け

い

Meanings

noun, noun which may take the genitive case particle 'no'

concave shape; concavity

Refers to a shape or form that is indented or hollowed inward. Often used in technical, design, or descriptive contexts. Antonym: 凸形 (convex shape).

Antonyms: 凸形

このレンズは凹おう形けいをしている。
This lens has a concave shape.
凹おう形けいの鏡かがみを使つかうと、像ぞうが小ちいさく映うつる。
When you use a concave mirror, the image appears smaller.

See all 3 example sentences ›

Kanji

凹concave, hollow, sunken
形shape, form, style
型mould, type, model

Related words

凸とつ形けい
凸形 means convex shape, the opposite of 凹形. Both are technical terms for describing surface curvature.

Opposites

凸とつ形けい
convex shape; convex

Written forms

凹形
- おうけい
  Standard kanji spelling for the reading おうけい. The reading おうがた is also used for this form in practice, but Restricted おうけい to 凹形.
- おうがた
凹おう型がたUsage100%
Common spelling for the reading おうがた. No restrict おうがた to a specific kanji form is specified, so both 凹形 and 凹型 can be read as おうがた.
おうがた
Kana spelling is acceptable and avoids kanji ambiguity, especially when the reading おうがた is intended.

Etymology

Compound of 凹 (concave) and 形/型 (shape/form). The reading おうけい is the on'yomi of the kanji, while おうがた combines on'yomi and kun'yomi. The exact historical derivation is uncertain, but the word is a straightforward technical term.