[ad_1] noun, plural ar·bo·res [ahr-buh-reez] /ˈɑr bəˌriz/. Botany.
  1. a tree.


  1. the US spelling of arbour


  1. a rotating shaft in a machine or power tool on which a milling cutter or grinding wheel is fitted
  2. a rotating shaft or mandrel on which a workpiece is fitted for machining
  3. metallurgy a part, piece, or structure used to reinforce the core of a mould

c.1300, herber, “herb garden,” from Old French erbier “field, meadow; kitchen garden,” from Latin herba “grass, herb” (see herb). Later “a grassy plot” (early 14c., a sense also in Old French), “a shaded nook” (mid-14c.). Probably not from Latin arbor “tree,” though perhaps influenced by its spelling.

The change from er- to ar- before consonants in Middle English also reflects a pronunciation shift: cf. farm from ferme, harbor from Old English herebeorg.

n. pl. ar•bo•res (ärbə-rēz′)

  1. A treelike anatomical structure.

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