Etymology
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broom (n.)

Old English brom, popular name for several types of shrubs common throughout Europe (used medicinally and for fuel) and characterized by long, slender branches and many yellow flowers, from Proto-Germanic *bræmaz "thorny bush" (source also of Dutch braam, German Brombeere "blackberry"), from PIE *bh(e)rem- "to project; a point."

As "twigs of broom tied together to a handle to make a tool for sweeping," mid-14c. Traditionally, both the flowers and sweeping with broom twigs were considered unlucky in May (Suffolk, Sussex, Wiltshire, etc.).

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tree (v.)

"to chase up a tree," 1700, from tree (n.). Meaning "take a tree-like form" is from 1884. Related: Treed; treeing.

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tree (n.)

Old English treo, treow "tree" (also "timber, wood, beam, log, stake"), from Proto-Germanic *trewam (source also of Old Frisian tre, Old Saxon trio, Old Norse tre, Gothic triu "tree"), from PIE *drew-o-, suffixed variant form of root *deru- "be firm, solid, steadfast," with specialized senses "wood, tree" and derivatives referring to objects made of wood.

The line which divides trees from shrubs is largely arbitrary, and dependent upon habit rather than size, the tree having a single trunk usually unbranched for some distance above the ground, while a shrub has usually several stems from the same root and each without a proper trunk. [Century Dictionary]

In Old English and Middle English also "thing made of wood," especially the cross of the Crucifixion and a gallows (such as Tyburn tree, famous gallows outside London). Middle English also had plural treen, adjective treen (Old English treowen "of a tree, wooden"). For Dutch boom, German Baum, the usual words for "tree," see beam (n.).

Meaning "framework of a saddle" is from 1530s. Meaning "representation of familial relationships in the form of a tree" is from c. 1300. Tree-hugger, contemptuous for "environmentalist" is attested by 1989.

Minc'd Pyes do not grow upon every tree,
But search the Ovens for them, and there they be.
["Poor Robin," Almanack, 1669]
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palm-tree (n.)

"tree or shrub of the order Palmae," Old English palm-treo; see palm (n.2) + tree (n.).

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pine-tree (n.)

Old English pintreow; see pine (n.) + tree (n.).

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axle-tree (n.)

also axletree, "bar or beam fitted crosswise under the body of a carriage and having wheels fitted to the ends," c. 1300; see axle (n.) + tree (n.).

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bo tree (n.)

1680s, from Sinhalese bo, from Pali bodhi, short for bodhi-taru "bo tree," literally "tree of wisdom or enlightenment" (related to Sanskrit buddhah "awakened," from PIE root *bheudh- "be aware, make aware") + taru "tree."

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shade-tree (n.)

"tree planted or valued for its shade," rather than for fruit, beauty, etc., 1806, American English, from shade (n.) + tree (n.).

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