The Collaborative International Dictionary of English v.0.48:

Scabrous \Sca"brous\, a. [L. scabrosus, fr. scaber rough: cf. F.
   scabreux.]
   1. Rough to the touch, like a file; having small raised dots,
      scales, or points; scabby; scurfy; scaly. --Arbuthnot.
      [1913 Webster]

   2. Fig.: Harsh; unmusical. [R.]
      [1913 Webster]

            His verse is scabrous and hobbling.   --Dryden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

scabrous
    adj 1: rough to the touch; covered with scales or scurf [syn:
           lepidote, leprose, scabrous, scaly, scurfy]
    2: dealing with salacious or indecent material; "a scabrous
       novel"