[ suhb-strey-tuh m, -strat-uh m, suhb-strey-tuh m, -strat-uh m ]
/ ˈsʌbˌstreɪ təm, -ˌstræt əm, sʌbˈstreɪ təm, -ˈstræt əm /

noun, plural sub·stra·ta [suhb-strey-tuh, -strat-uh, -suhb-strey-tuh, -strat-uh] /ˈsʌbˌstreɪ tə, -ˌstræt ə, -sʌbˈstreɪ tə, -ˈstræt ə/, sub·stra·tums.

Compare superstratum.

Origin of substratum

From New Latin, dating back to 1625–35; see origin at sub-, stratum
Related formssub·stra·tive, sub·stra·tal, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for substratum

British Dictionary definitions for substratum


/ (sʌbˈstrɑːtəm, -ˈstreɪ-) /

noun plural -strata (-ˈstrɑːtə, -ˈstreɪtə)

Derived Formssubstrative or substratal, adjective

Word Origin for substratum

C17: from New Latin, from Latin substrātus strewn beneath, from substernere to spread under, from sub- + sternere to spread
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 substratum



1630s, from Modern Latin substratum (plural substrata), neuter singular past participle of Latin substernere "to spread underneath," from sub- (see sub-) + sternere (see stratum).

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for substratum


[ sŭbstrā′təm, -străt′əm ]

Plural substrata substratums

An underlying layer or stratum.
A surface on which an organism grows or is attached; a substrate.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.