The Collaborative International Dictionary of English v.0.48:
Corbiestep \Cor"bie*step`\, n. (Arch.) One of the steps in which a gable wall is often finished in place of a continuous slope; -- also called crowstep. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Crowstep \Crow"step`\ (kr?"st?p`), n. (Arch.) See Corriestep. [1913 Webster]