exarch xylem

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• exarch — I. noun Etymology: Late Latin exarchus, from Late Greek exarchos, from Greek, leader, from exarchein to begin, take the lead, from ex + archein to rule, begin more at arch Date: 1588 1. a Byzantine viceroy 2. an Eastern bishop ranking below a… …   New Collegiate Dictionary

• Xylem — (8) im Querschnitt eines Blattes; (1) = Cuticula; (2) = obere Epidermis; (3) = Palisadengewebe; (4) = Schwammgewebe; (5) = untere Epidermis; (6) = Spalt der Spaltöffnung; (7) = Schließzellen; (8) = Xylem; (9) = Phloem; (10) = Blattader / Leit …   Deutsch Wikipedia

• exarch — exarch1 [eks′ärk΄] n. [LL exarchus, overseer of monasteries < Gr exarchos, leader, chief (in LGr, prefect, bishop): see EX 1 & ARCH] 1. a governor of an outlying province in the ancient Byzantine Empire 2. the supreme head of the independent… …   English World dictionary

• Xylem — Multiple cross sections of a flowering plant stem showing primary and secondary xylem and phloem[1] Xylem is one of the two types of transport tissue in vascular plants. (Phloem is the other). The word xylem is derived from the Classical Greek… …   Wikipedia

• exarch — exarch1 exarchal, adj. /ek sahrk/, n. 1. Eastern Ch. a. a patriarch s deputy. b. a title originally applied to a patriarch but later applied only to a bishop ranking below a patriarch and above a metropolitan. 2. the ruler of a province in the… …   Universalium

• exarch — I ex•arch [[t]ˈɛk sɑrk[/t]] n. 1) rel (in the Eastern Church) a) a patriarch s deputy b) a bishop ranking below a patriarch and above a metropolitan 2) why a Byzantine viceroy • Etymology: 1580–90; < LL exarchus superintendent < Gk éxarchos …   From formal English to slang

• exarch — I. /ˈɛksak/ (say eksahk) noun 1. (in the Eastern Church) a. a patriarch s deputy. b. (historically) a bishop ranking below a patriarch and above a metropolitan. 2. the ruler of a province in the Byzantine Empire. {Late Latin exarchus, from Greek… …  

• Lepidodendron — Taxobox image caption = The cone of Lepidodendron fossil range = Carboniferous regnum = Plantae divisio = Lycopodiophyta classis = Isoetopsida ordo = Lepidodendrales familia = Lepidodendraceae genus = Lepidodendron subdivision ranks = Species… …   Wikipedia

• Lepidodendrales — Taxobox image caption = A cone of Lepidodendron image width=100px image2 caption = A bifurcation in Lepidophloios fossil range = Carboniferous regnum = Plantae divisio = Lycopodiophyta classis = Isoetopsida ordo = Lepidodendrales familia =… …   Wikipedia

• Stele (biology) — In a vascular plant, the stele is the central part of the root or stem containing the tissues derived from the procambium. These include vascular tissue, in some cases ground tissue (pith) and a pericycle, which, if present, defines the outermost …   Wikipedia

• Lepidodendrales — Lepidodendron lycopodioides Zeitraum Devon bis Perm Systematik Reich …   Deutsch Wikipedia