副ふく木ぼくふくぼくMeanings1nounsplint; braceMedical device used to immobilize and support a broken bone or injured limb. Often used interchangeably with 添え木 (そえぎ).See also: 添え木 (そえぎ)骨こっ折せつした腕うでに副ふく木ぼくを当あてた。I put a splint on the broken arm.