- a prefix meaning “below,” used, with second elements of any origin, in the formation of compound words: infrasonic; infrared.
Origin of infra-
< Latin, representing infrā, adv. or preposition
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- below; beneath; afterinfrasonic; infralapsarian
from Latin infrā
Word Origin and History for infra-
Online Etymology Dictionary, © 2010 Douglas Harper
- Inferior to, below, or beneath:infrasonic.
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