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Tetartemorion (Ancient Greek: τεταρτημόριον tetartēmorion) is silver coin minted in Ancient Greece, valued at 1/4 of an obol. Its name means "quarter part", from tetarton, meaning a fourth, and morion part, portion.
The weight at Athens was about 0.15-0.18 grams.
References
Tetartemorion Wikipedia(Text) CC BY-SA