noun, noun which may take the genitive case particle 'no'
columnar; cylindrical; column-shaped
Describes something having the shape of a column or cylinder. Often used in technical or descriptive contexts.
この建物は円柱状の柱で支えられている。
This building is supported by cylindrical pillars.
円柱状の容器に
Pour the liquid into a cylindrical container.
円筒状 also means 'cylindrical', but 円筒 emphasizes a hollow tube, while 円柱 can be solid or hollow.
Compound of 円柱 (cylinder, column) + 状 (shape, form). The reading is standard on'yomi.