Webster’s Revised Unabridged Dictionary · 1913
Riprap
Rip′rap′ (·răp′), n. [Cf. Rap.] (Masonry) A foundation or sustaining wall of stones thrown together without order, as in deep water or on a soft bottom.
Rip′rap′, v. t. [imp. & p. p. Riprapped; p. pr. & vb. n. Riprapping.] To form a riprap in or upon.