Etymology
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horsetail (n.)

c. 1400, from horse (n.) + tail (n.). As a kind of plant, from 1530s.

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Definitions of horsetail

horsetail (n.)
perennial rushlike flowerless herbs with jointed hollow stems and narrow toothlike leaves that spread by creeping rhizomes; tend to become weedy; common in northern hemisphere; some in Africa and South America;
From wordnet.princeton.edu