Likewise or similarly in other lexica; references at Photius pi552 Theodoridis. The headword is masculine nominative plural of this adjective. It must be quoted from somewhere, perhaps from the medical writer Diphilos of Siphnos (C3 BCE), quoted in Athenaeus, Deipnosophists 22.61D (2.59 Kaibel): one risks death by eating mushrooms which are "black and livid and hard".
cf. generally pi 945, pi 946.