noun, plural equisetums, equiseta [ek-wuh-see-tuh] .
any plant of the genus Equisetum, comprising the horsetails.

1820–30; < Neo-Latin; Latin equisaetum, equivalent to equi-, combining form of equus horse + saet(a) bristle + -um neuter noun suffix

equisetic, adjective
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World English Dictionary
equisetum (ˌɛkwɪˈsiːtəm)
n , pl -tums, -ta
any tracheophyte plant of the genus Equisetum, which comprises the horsetails
[C19: New Latin, changed from Latin equisaetum, from equus horse + saeta bristle]

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