peperino

CIDE DICTIONARY

peperinon. [It. peperino, L. piper pepper. So called on account of its color.].
     A volcanic rock, formed by the cementing together of sand, scoria, cinders, etc.  [1913 Webster]

OXFORD DICTIONARY

peperino, n. a light porous (esp. brown) volcanic rock formed of small grains of sand, cinders, etc.

Etymology
It. f. pepere pepper

For further exploring for "peperino" in Webster Dictionary Online


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