sudariolum
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
sūdārĭŏlum: i, n.
dim. sudarium,
I a little handkerchief, Hier. Ep. 52, 5; App. Mag. p. 307, 37 al.