[ sawr-uh s, sohr- ]
/ ˈsɔr əs, ˈsoʊr- /

noun, plural so·ri [sawr-ahy, sohr-ahy] /ˈsɔr aɪ, ˈsoʊr aɪ/.

Botany. one of the clusters of sporangia on the back of the fronds of ferns.
Mycology. a soruslike spore mass of certain fungi and lichens.

Nearby words

  1. sortilege,
  2. sorting,
  3. sorting tracks,
  4. sorting yard,
  5. sortition,
  6. sos,
  7. sosa,
  8. sosa, sammy,
  9. sosatie,
  10. soseki

Origin of sorus

1825–35; < New Latin < Greek sōrós heap Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for sorus

British Dictionary definitions for sorus


/ (ˈsɔːrəs) /

noun plural -ri (-raɪ)

a cluster of sporangia on the undersurface of certain fern leaves
any of various similar spore-producing structures in some lichens and fungi

Word Origin for sorus

C19: via New Latin from Greek sōros a heap

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 sorus


[ sôrəs ]

Plural sori (sôrī)

A cluster of sporangia borne on the underside of a fern frond. A sorus is sometimes covered by an indusium. Also called fruitdot
A reproductive structure consisting of masses of spores, characteristic of certain fungi such as rusts and smuts.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.