hesperid-Gr. ἑσπεριδ- stem of Ἑσπερίδ-ες Hesperides, forming technical terms of Botany and Chemistry, in the sense ‘of or derived from the orange and its congeners’: see Hesperides 2. a.Bot.heˈsperidate, hespeˈrideousadjs., of the structure of the orange; of the orange kind. ‖ hespeˈridium, a fruit of the structure of the orange, a many-celled superior indehiscent fruit, pulpy within and covered by a separable rind. b.Chem.heˈsperidene, heˈsperidin, heˈsperidine, chemical products obtained from the hesperideous fruits. See also hesper-.a.1876Harley Mat. Med. (ed. 6) 696 Fruit *hesperidate, with a hard rind.1886Syd. Soc.Lex., *Hesperideous, of, or belonging to, or having, an arrangement of parts, as in the orange.1866Treas.Bot. 586/1 *Hesperidium.1875Bennett & Dyer tr.Sachs' Bot. 539 Closely resembling the berry is the fruit of the various species of Citrus, sometimes called Hesperidium, the pericarp of which consists of a leathery outer layer and a pithy inner layer.1880Gray Struct.Bot. vii. §2. 299 The Hesperidium (orange, lemon, and lime)..is a mere variety of the berry.b.1875Watts Dict.Chem. VII. 644 *Hesperidene, the terpene of essential oil of orange-peel.1886Syd. Soc.Lex., Hesperidene, C10H16..the oil of Seville orange.1838T. Thomson Chem.Org. Bodies 764 Of *Hesperidin. This substance was discovered by M. Lebreton, in 1828, in the unripe fruits of different species of orange and lemon trees.1882Encycl.Brit. XIV. 438/1 In the white portion of the peel [of lemon]..a bitter principle called *hesperidine has been found.