σανίδιον
From LSJ
κακοὶ μάρτυρες ἀνθρώποισιν ὀφθαλμοὶ καὶ ὦτα βαρβάρους ψυχὰς ἐχόντων → eyes and ears are poor witnesses for men if their souls do not understand the language (Heraclitus Phil.: Fr. B 107; Testimonia: Fragment 16, line 6)
English (LSJ)
[ῐδ], τό, Dim. of σανίς,
A small board or plank, Ar.Pax202, Hippias (?) in PHib.1.13.30, Men.202, Str.17.1.50. II tablet, public register, ἐκ σανιδίου Lys.16.6, cf. Aeschin.3.200,201, IG12.313.161, 22.1237.124. III small splint, Heliod. ap. Orib.44.23.74, Gal.18(2).888; foot-prop, Id.10.444.