βοστρύχον
From LSJ
Τὸ μανθάνειν δ᾽ ἥδιστον εὖ λέγοντος, εἰ κέρδος λέγοι → It is the sweetest thing to learn from one speaking well, if they speak profitably
Russian (Dvoretsky)
βοστρύχον: τό
1) маленький локон, завитушка, кудряшка Anth.;
2) бот. виноградный усик Arst.