ἀνθάλιον
From LSJ
Δελφῖνα νήχεσθαι διδάσκεις: ἐπὶ τῶν ἐν ἐκείνοις τινὰ παιδοτριβούντων, ἐν οἷς ἤσκηται → Teaching dolphins to swim: is applied to those who are teaching something among people who are already well versed in it
English (LSJ)
τό, A = μαλιναθάλλη, Plin.HN21.88,175.
Greek (Liddell-Scott)
ἀνθάλιον: τό, φυτόν τι, τὸ κατὰ Λινναῖον cyperus esculentum, Πλίν. h. n. XXI. 52.
Spanish (DGE)
-ου, τό
bot. chufa, Cyperus esculentus L., Plin.HN 21.88, 175.