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equisetum

[ek-wuh-see-tuh m]
noun, plural eq·ui·se·tums, eq·ui·se·ta [ek-wuh-see-tuh] /ˌɛk wəˈsi tə/.
  1. any plant of the genus Equisetum, comprising the horsetails.
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Origin of equisetum

1820–30; < New Latin; Latin equisaetum, equivalent to equi-, combining form of equus horse + saet(a) bristle + -um neuter noun suffix
Related formseq·ui·se·tic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for equisetic

equisetum

noun plural -tums or -ta (-tə)
  1. any tracheophyte plant of the genus Equisetum, which comprises the horsetails
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Word Origin

C19: New Latin, changed from Latin equisaetum, from equus horse + saeta bristle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012