rendrock|ˈrɛndrɒk| [f. rend v.1 + rock n.] A kind of explosive. 1880Libr.Univ.Knowl. (N.Y.) II. 628 The explosives were dynamite, rendrock and vulcan powder.1881Lock Spons' Encycl. III. 901 A number of semi-solid mixtures, such as dynamite,..giant powder, rendrock.