[1] The noun -- quoted from Callimachus: see next note -- and its glosses are all in the accusative singular. Not the usual word for a pestle, which may be δοῖδυξ (e.g. Aristophanes, Knights 283), τριβεύς (e.g. Aristophanes, Peace 259), or ἀλιτρίβανος (Aristophanes, Peace 258, 265 and 270). For δοῖδυξ see in particular delta 1560 and for ἀλιτρίβανος see alpha 1146.
[2] Callimachus, Hecale fr.286, repeated by Nicander, Theriaca 109. (A modern reader might object that a pestle is not at all like a ladle.)