[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 doi=duc (e.g. Aristophanes, Knights 283), tribeu/s (e.g. Aristophanes, Peace 259), or a)litri/banos (Aristophanes, Peace 258, 265 and 270). For doi=duc see in particular delta 1560 and for a)litri/banos 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.)