Webster
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Webster’s Revised Unabridged Dictionary · 1913

Thunderhead

Thun′der·head′ (·hĕd′), n. A rounded mass of cloud, with shining white edges; a cumulus, — often appearing before a thunderstorm.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.