English

Noun

rockhead ‎(plural rockheads)

1. (geology) The surface of the bedrock beneath soil cover.
   • 2012, P. B. Attewell, ‎I. W. Farmer, Principles of Engineering Geology (page 457)

     This type of area, with reasonably well-defined rockheads under glacial and lacustrine deposits, probably represents optimum conditions for the adoption of seismic exploration techniques.

2. The fish Bothragonus swanii, a variety of poacher.

Etymology 2

rock +‎ -head

Noun

rockhead ‎(plural rockheads)

1. (slang) A fan of rock music.
   • 1997, New York Magazine (volume 30, number 15, page 65)

     […] an apparent betrayal of electronica's more oblique, less suburban ethos in favor of a record the rockheads like.