Definition of pedregal in US English:

pedregal

(also pedrigal)

noun

  • In Mexico and the south-western U.S.: a rough and rocky tract, especially in a volcanic region; an old lava field.

Origin

Mid 19th century; earliest use found in The Penny Cyclopaedia. From Spanish pedregal stony area, apparently from Spanish piedra stone + -eg- (of uncertain origin; compare pedregoso rocky (972)) + -al (apparently showing -al).