[ suh-ree-dee-uh m ]
/ səˈri di əm /

noun, plural so·re·di·a [suh-ree-dee-uh] /səˈri di ə/. (in a lichen)

a group of algal cells surrounded by hyphal tissue, occurring on the surface of the thallus and functioning in vegetative reproduction.

Nearby words

  1. sore point, a,
  2. sore shin,
  3. sore throat,
  4. soredial,
  5. sorediate,
  6. sorehead,
  7. sorel,
  8. sorel, georges,
  9. sorely,
  10. sorensen

Origin of soredium

1820–30; < New Latin, diminutive of Greek sōrós a heap

Also called brood bud, hologonidium.

Related formsso·re·di·ate [suh-ree-dee-it, -eyt] /səˈri di ɪt, -ˌeɪt/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for soredium


/ (sɔːˈriːdɪəm) /


an organ of vegetative reproduction in lichens consisting of a cluster of algal cells enclosed in fungal hyphae: dispersed by wind, insects, or other means

Word Origin for soredium

C19: 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