so·​rus | \ ˈsȯr-əs How to pronounce sorus (audio) \
plural sori\ ˈsȯr-​ˌī How to pronounce sorus (audio) , -​ˌē \

Definition of sorus

: a cluster of plant reproductive bodies: such as
a : a cluster of sporangia on the underside of a fertile fern frond
b : a mass of spores bursting through the epidermis of the host plant of a parasitic fungus
c : a cluster of gemmae on the thallus of a lichen

Examples of sorus in a Sentence

Recent Examples on the Web Just 4 pounds of sorus can seed 30,000 pounds of kelp for harvest., 26 June 2021 Fishermen place spore-holding sorus tissue along lengths of rope and submerge them, letting Mother Nature do the rest., 26 June 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'sorus.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of sorus

1832, in the meaning defined above

History and Etymology for sorus

New Latin, from Greek sōros heap

Learn More About sorus

Dictionary Entries Near sorus

sort through



See More Nearby Entries 

Statistics for sorus

Cite this Entry

“Sorus.” Dictionary, Merriam-Webster, Accessed 26 May. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More from Merriam-Webster on sorus Encyclopedia article about sorus


Test Your Vocabulary

Eponyms: Words Named After People

How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!