fern

[ furn ]
/ fɜrn /

noun

any seedless, nonflowering vascular plant of the class Filicinae, of tropical to temperate regions, characterized by true roots produced from a rhizome, triangular fronds that uncoil upward and have a branching vein system, and reproduction by spores contained in sporangia that appear as brown dots on the underside of the fronds.

Origin of fern

before 900; Middle English ferne, Old English fearn; cognate with German Farn fern, Sanskrit parná feather

Related forms

fern·less, adjectivefern·like, adjective

Definition for fern (2 of 2)

Fern

[ furn ]
/ fɜrn /

noun

a female given name.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for fern

British Dictionary definitions for fern

fern

/ (fɜːn) /

noun

any tracheophyte plant of the phylum Filicinophyta, having roots, stems, and fronds and reproducing by spores formed in structures (sori) on the frondsSee also tree fern
any of certain similar but unrelated plants, such as the sweet fern

Derived Forms

fernlike, adjectiveferny, adjective

Word Origin for fern

Old English fearn; related to Old High German farn, Sanskrit parná leaf
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

Science definitions for fern

fern

[ fûrn ]

Any of numerous seedless vascular plants belonging to the phylum Pterophyta that reproduce by means of spores and usually have feathery fronds divided into many leaflets. Most species of ferns are homosporous (producing only one kind of spore). The haploid spore grows into a small, usually flat gametophyte known as a prothallus, which is undifferentiated into roots, stems, and leaves. The green prothallus anchors itself with hairlike extensions known as rhizoids and bears both archegonia (organs producing female gametes) and antheridia (organs producing male gametes). The male gametes require the presence of water to swim to the female gametes and fertilize the eggs. Normally only one embryo is produced, and it then grows out of the gametophyte plant as a diploid sporophyte plant that has roots, stems, and leaves and conducts photosynthesis, while the smaller gametophyte withers away. The leaves of these sporophytes eventually produce sporangia (in some species occurring in clusters known as sori). Under dry conditions, the sori burst releasing hundreds of thousands or millions of spores. Ferns were abundant in the Carboniferous period and exist today in about 11,000 species, about three-quarters of which live in tropical climates.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.