From crust + -al.
crustal (comparative more crustal, superlative most crustal)
- Of, pertaining to, or forming a crust, especially the crust of the Earth or other planet.
- 2003, Bill Bryson, A Short History of Nearly Everything, BCA, p. 189:
- The hope was to lower a drill through over 4,000 metres of Pacific Ocean water off the coast of Mexico and drill some 5,000 metres through relatively thin crustal rock.
crustal (feminine singular crustale, masculine plural crustaux, feminine plural crustales)