ἐπέρεισμα

ατος, τό
A. support, foundation, τὰ μαθηματικὰ ἐπὶ ταῖς ἰδέαις ἔχειν τὸ ἐ. Iamb. Comm.Math. 8.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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