noun
surplus soil; excavated earth; construction spoil
Refers to soil or earth dug out during construction or civil engineering work that is not reused on-site and must be disposed of or managed.
工事で出た残土は、別の場所に運ばれた。
The surplus soil from the construction was transported to another location.
残土処理の費用が予想以上にかかった。
The cost of disposing of the excavated earth was higher than expected.
Compound of 残 (remaining, leftover) and 土 (soil, earth). The reading ざんど is a standard on'yomi combination.