noun, plural stro·ma·ta [stroh-muh-tuh] /ˈstroʊ mə tə/.
  1. Cell Biology. the supporting framework or matrix of a cell.
  2. Anatomy. the supporting framework, usually of connective tissue, of an organ, as distinguished from the parenchyma.
  3. Mycology. (in certain fungi) a compact, somatic mass of fungous tissue, in or on which the fructifications may be developed.
  4. Botany. the matrix of a chloroplast, containing various molecules and ions.

Origin of stroma

1825–35; < Late Latin strōma mattress < Greek strôma bed-covering; akin to Latin sternere to spread, strew, strātum (see stratum)
Related formsstro·mat·ic [stroh-mat-ik] /stroʊˈmæt ɪk/, stro·mal, stro·ma·tous, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for stroma

Historical Examples of stroma

British Dictionary definitions for stroma


noun plural -mata (-mətə) biology
  1. the gel-like matrix of chloroplasts and certain cells
  2. the fibrous connective tissue forming the matrix of the mammalian ovary and testis
  3. a dense mass of hyphae that is produced by certain fungi and gives rise to spore-producing bodies
Derived Formsstromatic (strəʊˈmætɪk) or stromatous, adjective

Word Origin for stroma

C19: via New Latin from Late Latin: a mattress, from Greek; related to Latin sternere to strew
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

Word Origin and History for stroma

1832, in anatomy, plural stromae, Modern Latin, from Latin stroma "bed covering," from Greek stroma "anything spread out for lying or sitting on" (see structure (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper

stroma in Medicine


n. pl. stro•ma•ta (-mə-tə)
  1. The connective tissue framework of an organ, a gland, or other structure, as distinguished from the tissues performing the special function of the organ or part.
  2. The spongy and colorless framework of a cell.
Related formsstromal adj.stro•matic (-mătĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.