One of the mysteries of the English language finally explained.
In Mexico and the south-western U.S.: a rough and rocky tract, especially in a volcanic region; an old lava field.
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).
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