The Collaborative International Dictionary of English v.0.48:
audiotape \audiotape\ n. 1. magnetic tape for use in recording sound. [WordNet 1.5] 2. a tape recording of sound. [WordNet 1.5] audiovisualWordNet (r) 3.0 (2006):
audiotape n 1: a tape recording of sound 2: magnetic tape for use in recording sound