free vs. premium
premium features
rewards
pricing - single
pricing - family
pricing - organizations
connect
our blog
the invisible cause
initiatives
contact us
about us
LearnThat Foundation
testimonials
LearnThatWord and...
who uses it
our partners
resources
Open Dictionary of English
About the ODE
word list archive
word roots
suffixes
English oddities
get started
How it works - videos
start student account
start teacher account
schools & higher ed
tutors and IEP
log in
Join now
Synonyms for Hardpan
(same or very similar meaning)
WordNet sense 1
(crust or layer of hard subsoil encrusted with calcium-carbonate occurring in arid or semiarid regions)
:
caliche
From the ODE community, based on WordNet
add/edit
