a person who removes weeds, as from a garden or lawn.
a device, as a tool or machine, for removing weeds.

1400–50; late Middle English; see weed1, -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
weed1 (wiːd)
1.  any plant that grows wild and profusely, esp one that grows among cultivated plants, depriving them of space, food, etc
2.  slang
 a.  the weed tobacco
 b.  marijuana
3.  informal a thin or unprepossessing person
4.  an inferior horse, esp one showing signs of weakness of constitution
5.  to remove (useless or troublesome plants) from (a garden, etc)
[Old English weod; related to Old Saxon wiod, Old High German wiota fern]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Slang Dictionary

weeder definition

  1. n.
    a difficult introductory college course designed to get rid of the weaker students; a course meant to weed out the weaker students. : Don't get into the morning section of the course. The prof is tough and thinks it's supposed to be a weeder.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
Because the engine was still running, the weeder bar was rotating.
Seedlings may be killed with a low-intensity flame weeder during the early stage of their development.
The third system is also wheat-fallow, but it uses sweep tillage and a rod-weeder to control weeds.
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