(Νικήρατος), a Greek writer on plants, one of the followers of Asclepiades of Bithynia (Dioscor. De Mat. Med. i. praef. vol. i. p. 2; St. Epiphan. Adv. Haeres. 1.1. 3, p. 3, ed. Colon. 1682), who is quoted by Asclepiades Pharmacion (ap. Gal. De Compos. Medicam. see. Loc. 3.1, vol. xii. p. 634), and must, therefore, have lived in the latter half of the first century, B. C. His medical formulae are several times quoted by Galen (De Compos. Medicam. sec. Loc. vol. xiii. pp. 87, 96, 98, 110, &c., De Antid. 2.15, vol. xiv. p. 197), and once by Pliny (Plin. Nat. 32.31). Caelius Aurelianus mentions that he wrote a work on catalepsy (De Morb. 2.5, p. 376).