[ 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 forms

sub·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 Forms

substrative 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

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.