noun Botany.

  1. the stem or trunk of a tree.


  1. any of a variety of soft, unctuous clays of various colors, used as pigments.
  2. a medium red-brown color made from such clay.


  1. the trunk of a tree


  1. a reddish soft variety of clay used as a pigment
  2. a moderate reddish-brown colour

early 14c., from Old Norse bolr “tree trunk,” from Proto-Germanic *bulas (cf. Middle Dutch bolle “trunk of a tree”), from PIE *bhel- (2) “to blow, inflate, swell” (cf. Greek phyllon “leaf,” phallos “swollen penis;” Latin flos “flower,” florere “to blossom, flourish,” folium “leaf;” Old Prussian balsinis “cushion;” Old Norse belgr “bag, bellows;” Old English bolla “pot, cup, bowl;” Old Irish bolgaim “I swell,” blath “blossom, flower,” bolach “pimple,” bolg “bag;” Breton bolc’h “flax pod;” Serbian buljiti “to stare, be bug-eyed;” Serbo-Croatian blazina “pillow”).

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