πέτριον
From LSJ
τὰ σῦκα σῦκα, τὴν σκάφην δὲ σκάφην ὀνομάζειν → call a spade a spade | speak the truth | speak straight from the shoulder | give it straight from the shoulder | give the straight goods | not to mince matters | not to mince words | not mince words | call things by their right names | call a spade a spade and a shovel a shovel | call a shovel a shovel | call a spade a spade, not a big spoon
English (LSJ)
A v. πετραῖον.
German (Pape)
[Seite 606] τό, ein Kraut, vielleicht = πετροσέλινον, Nic. frg. 5, 2, wo ι lang sein müßte, ist πετραίου zu lesen.