| 释义 |
‖ hypoderma|hɪpəʊ-, haɪpəʊˈdɜːmə|
Pl. -dermata,
[mod.L., f. Gr. ὑπό under + δέρµα skin; cf. hypodermis.]
1. Zool. A tissue or layer lying beneath the skin or outer integument: as the membrane that lines the under-side of the elytra of Coleoptera (obs.); ‘the soft cellular layer lying under the carapace of the Arthropoda and the thick cuticle of Vermes and Nematoda’; ‘the subcutaneous areolar tissue of the skin of mammals’ (Syd. Soc. Lex. 1886).
1826Kirby & Sp. Entomol. xxxiii. III. 373. Ibid. xxxv. 600 An oblong..spot, occasioned by the hypoderma in that part being particularly tense. Ibid. xlvii. IV. 413.
2. Bot. A layer of cells lying immediately under the epidermis of a leaf or stem.
1877Bennett tr. Thomé's Struct. & Phys. Bot. 58 In many cases, there lie beneath the epidermis, peculiar layers or strings of cells (the hypoderma). 1884Bower & Scott De Bary's Phaner. 404 In most cases..the outer cortex of the stem is built up of two more or less distinct parts; one, the Hypoderma, bordering directly on the epidermis..the other, a thinner-walled, internal mass of parenchyma. Ibid. 411 The cells in many-layered hypodermata increase in size towards the inside.
Hence hypoˈdermal a., of or pertaining to the hypoderma.
1854Owen Skel. & Teeth in Circ. Sc., Organ. Nat. I. 50 The hypodermal system in mammals. 1875Bennett & Dyer Sach's Bot. 376 Bundles or layers of firm thick-walled cells (Hypodermal Tissue) are of common occurrence [in Equisetaceæ]. 1884Bower & Scott De Bary's Phaner. 225 A group of tissues bordering directly on the epidermis is called from its position hypodermal, while distinct hypodermal layers are indicated by the substantive hypoderma. |