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出典:Wiktionary
Apparently a reduplication (with vowel dissimilation) of rap (“blow, stroke”).
riprap (countable かつ uncountable, 複数形 ripraps)
riprap (三人称単数 現在形 ripraps, 現在分詞 riprapping, 過去形および過去分詞形 riprapped)
出典:Wikipedia
出典:『Wikipedia』 (2011/05/13 15:28 UTC 版)
Riprap — also known as rip rap, rubble, shot rock or rock armour — is rock or other material used to armor shorelines, streambeds, bridge abutments, pilings and other shoreline structures against scour, water or ice erosion.
riprap