pith sheath

См. также в других словарях:

• medullary sheath — noun a layer of myelin encasing (and insulating) the axons of medullated nerve fibers • Syn: ↑myelin sheath • Hypernyms: ↑sheath, ↑case • Part Holonyms: ↑medullated nerve fiber, ↑ …   Useful english dictionary

• Medullary sheath — Medullary Med ul*la*ry, a. [L. medullaris, fr. medulla marrow: cf. F. m[ e]dullaire.] 1. (Anat.) (a) Pertaining to, consisting of, or resembling, marrow or medulla. (b) Pertaining to the medula oblongata. [1913 Webster] 2. (Bot.) Filled with… …   The Collaborative International Dictionary of English

• medullary sheath — med′ullary sheath′ n. 1) bot a narrow zone made up of the innermost layer of woody tissue immediately surrounding the pith in plants 2) anat. myelin sheath • Etymology: 1840–50 …   From formal English to slang

• medullary sheath — n. 1. Anat. a layer of myelin forming a sheath around certain nerve fibers 2. Bot. a ring of primary xylem around the pith of some stems …   English World dictionary

• medullary sheath — 1. Bot. a narrow zone made up of the innermost layer of woody tissue immediately surrounding the pith in plants. 2. Anat. See myelin sheath. [1840 50] * * * …   Universalium

• medullary sheath — /məˈdʌləri ʃiθ/ (say muh duluhree sheeth) noun 1. a narrow zone made up of the innermost layer of woody tissue immediately surrounding the pith in plants. 2. → myelin …  

• Glossary of plant morphology terms — Biologists that study plant morphology use a number of different terms to describe plant organs and parts that can be observed with the human eye using no more than a hand held magnifying lens. These terms are used to identify and classify plants …   Wikipedia

• angiosperm — /an jee euh sperrm /, n. Bot. a plant having its seeds enclosed in an ovary; a flowering plant. Cf. gymnosperm. [ANGIO + SPERM] * * * ▪ plant Introduction       any member of the more than 300,000 species of flowering plants (division Anthophyta) …   Universalium

• Medullary — Med ul*la*ry, a. [L. medullaris, fr. medulla marrow: cf. F. m[ e]dullaire.] 1. (Anat.) (a) Pertaining to, consisting of, or resembling, marrow or medulla. (b) Pertaining to the medula oblongata. [1913 Webster] 2. (Bot.) Filled with spongy pith;… …   The Collaborative International Dictionary of English

• Medullary groove — Medullary Med ul*la*ry, a. [L. medullaris, fr. medulla marrow: cf. F. m[ e]dullaire.] 1. (Anat.) (a) Pertaining to, consisting of, or resembling, marrow or medulla. (b) Pertaining to the medula oblongata. [1913 Webster] 2. (Bot.) Filled with… …   The Collaborative International Dictionary of English

• Medullary rays — Medullary Med ul*la*ry, a. [L. medullaris, fr. medulla marrow: cf. F. m[ e]dullaire.] 1. (Anat.) (a) Pertaining to, consisting of, or resembling, marrow or medulla. (b) Pertaining to the medula oblongata. [1913 Webster] 2. (Bot.) Filled with… …   The Collaborative International Dictionary of English