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s.v.

From LSJ

ἄνω ποταμῶν ἱερῶν χωροῦσι παγαί → the springs of sacred rivers flow upward, backward to their sources flow the streams of holy rivers

Source

Abbreviation of Latin sub verbo (under the word, under the words) or sub voce (under the word or heading), plural sub verbis resp. sub vocibus.