tree — trē n an anatomical system or structure having many branches <the vascular tree> see BILIARY TREE, BRONCHIAL TREE, TRACHEOBRONCHIAL TREE * * * (tre) 1. a perennial of the plant kingdom characterized by having a main stem or trunk and… … Medical dictionary
tree — I. noun Etymology: Middle English, from Old English trēow; akin to Old Norse trē tree, Greek drys, Sanskrit dāru wood Date: before 12th century 1. a. a woody perennial plant having a single usually elongate main stem generally with few or no… … New Collegiate Dictionary
Tree — /tree/, n. Sir Herbert Beerbohm /bear bohm/, (Herbert Beerbohm), 1853 1917, English actor and theater manager; brother of Max Beerbohm. * * * I Woody perennial plant. Most trees have a single self supporting trunk containing woody tissues, and in … Universalium
Vascular plant — Vascular Plants Temporal range: Mid Silurian [1] Recent Scientific classification Kingdom … Wikipedia
tree — treelike, adj. /tree/, n., v., treed, treeing. n. 1. a plant having a permanently woody main stem or trunk, ordinarily growing to a considerable height, and usually developing branches at some distance from the ground. 2. any of various shrubs,… … Universalium
Vascular tissue — This is an article about vascular tissue in plants. For transport in animals, see Circulatory system. Vascular tissue is a complex tissue found in vascular plants, meaning that it is composed of more than one cell type. The primary components of… … Wikipedia
Tree — For other uses, see Tree (disambiguation). Trees on a mountain in northern Utah during early autumn … Wikipedia
tree fern — any of various ferns, mostly tropical and chiefly of the family Cyatheaceae, that attain the size of trees, sending up a straight trunklike stem with foliage at the summit. [1840 50] * * * Any of various ferns (especially those of the families… … Universalium
tree bark — noun all the tissues of a tree external to the vascular cambium; includes epidermis, cortex and phloem … Wiktionary
lower vascular plant — ▪ biology Introduction formerly pteridophyte, also called vascular cryptogam, any of the spore bearing vascular plants, including the ferns, club mosses, spike mosses, quillworts, horsetails, and whisk ferns. Once considered of the… … Universalium
prueba entóptica vascular de Purkinje — Eng. Purkinje s tree test Prueba en la que poniendo un foco de luz directamente sobre el párpado cerrado el ojo percibe unas imágenes que corresponden al árbol vascular retiniano … Diccionario de oftalmología