eristalis
From LSJ
Λύπης ἰατρός ἐστιν ἀνθρώποις λόγος – For men reason is a healer of grief – Für Menschen ist der Trauer Arzt allein das Wort – Maeroris unica medicina oratio.
Latin > English (Lewis & Short)
ĕristălis: is, f.,
I an unknown precious stone, Plin. 37, 10, 58, § 160 (dub.—Jan. erythallis).