底てい部ぶMeanings1nounbase; bottomRefers to the lowest part or underside of a physical object, container, or structure. Often used in technical or descriptive contexts.箱はこの底てい部ぶに小ちいさな穴あなが開あいている。There is a small hole in the bottom of the box.この容よう器きは底てい部ぶが広ひろくて安あん定ていしている。This container has a wide base and is stable.