• synonyms


[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

Examples from the Web for equisetum

Historical Examples

  • At about 5,000 feet I first saw horsetails (Equisetum), very like our own species.

    The Malay Archipelago

    Alfred Russell Wallace

  • Insipid milk, and lead-coloured butter, from equisetum fluviatile.

  • In this connection his figuring young plants of Equisetum attached to prothalli is interesting.

  • Near the shore grew the Naked Horse-tail (Equisetum hyemale), having a shoot springing from its root on each side.

    Lachesis Lapponica

    Carl von Linn

  • The corn-fields here produce Echioides (Lycopsis arvensis), and the woods the most slender kind of Equisetum (sylvaticum).

    Lachesis Lapponica

    Carl von Linn

British Dictionary definitions for 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