Webster's English Dictionary

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tree

1. tree \'tre-\ \-l*s\ n [ME, fr. OE tre-ow; akin to ON tre- tree, Gk drys, 
   Skt] often attrib da-ru wood 1a: a woody perennial plant having a single 
   usu. elongate main stem general ly with few or no branches on its lower 
   part 1b: a shrub or herb of arborescent form {rose ~s} {a bana na ~} 2a1: a 
   piece of wood (as a post or pole) usu. adapted to a particular use o r 
   forming part of a sturcture or implement archaic  2a2: the cross on which 
   Jesus was crucified  archaic  2b: GALLOWS  3: something in the form of or 
   felt to resemble a tree : as  3a: a diagram that depicts a branching from 
   an original stem {genealogica l ~} 3b: an arborescent aggregation of 
   crystals  3c: a much-branched system of channels esp. in an animal body 
   {the vascul ar ~} - tree.less aj
2. tree vt or treed;  or tree.ing 1a: to drive to or up a tree {treed by a 
   bull} {dogs ~Xing game} 1b: to bring to bay : CORNER  2: to furnish or fit 
   with a tree