添え木、添木、副え木
そえぎ
soegi
JMdict entry #1804780
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noun (common) (futsuumeishi)
medicine
splint; brace; epithesis
see: 副木・ふくぼく
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noun (common) (futsuumeishi)
splice; support (e.g. for a plant); prop
see: 支柱・しちゅう