Webster
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Webster’s Revised Unabridged Dictionary · 1913

Gallon

Gal′lon (găl′lŭn), n. [OF galon, jalon, LL. galo, galona, fr. galum a liquid measure; cf. F. jale large bowl. Cf. Gill a measure.] A measure of capacity, containing four quarts; — used, for the most part, in liquid measure, but sometimes in dry measure.

☞ The standart gallon of the Unites States contains 231 cubic inches, or 8.3389 pounds avoirdupois of distilled water at its maximum density, and with the barometer at 30 inches. This is almost exactly equivalent to a cylinder of seven inches in diameter and six inches in height, and is the same as the old English wine gallon. The beer gallon, now little used in the United States, contains 282 cubic inches. The English imperial gallon contains 10 pounds avoirdupois of distilled water at 62° of Fahrenheit, and barometer at 30 inches, equal to 277.274 cubic inches.

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. Of the others, 1,362 (a word or a single letter each) were inferred by AI from the context by the dictionary’s own rules and are marked with a wavy underline (tap or point at one to see the note); the rest, which could not be inferred with confidence, are left as “?”.