• 柱はしら — pillar
• 柱石ちゅうせき — cornerstone
• 円柱えんちゅう — cylindrical column
• 支柱しちゅう — support post
• 角柱かくちゅう — rectangular prism
• 鉄柱てっちゅう — iron pillar

The character 柱 combines 木 (tree/wood) with 主 (main, master), suggesting a main piece of wood — a central support post. It often appears in construction-related words, as well as metaphorical contexts for leadership or foundation.

この柱はしらは家いえの中心ちゅうしんを支ささえています。
This pillar supports the center of the house.

チームの柱はしらとして活躍かつやくしています。
They play a key role as a pillar of the team.

🎧 Listen to チュウ and はしら.