Vine's Expository Dictionary of NT Words
a diminutive of the Latin as, was one-tenth of a drachma, or one-sixteenth of a Roman denarius, i.e., about three farthings, Matthew 10:29; Luke 12:6 .
was the Latin quadrans, "the fourth part of an as" (see No. 1), about two thirds of a farthing, Matthew 5:26; Mark 12:42 .
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Vines, W. E., M. A. Entry for 'Farthing'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/f/farthing.html. 1940.