Rip"rap` (?), n. [Cf. Rap.] Masonry
A foundation or sustaining wall of stones thrown together without order, as in deep water or on a soft bottom.
© Webster 1913.
Rip"rap`, v. t. [imp. & p. p. Riprapped (?); p. pr. & vb. n. Riprapping.]
To form a riprap in or upon.
© Webster 1913.