hypostyle
Concise Oxford English Dictionary © 2008 Oxford University Press:
hypostyle /ˈhʌɪpə(ʊ)stʌɪl/
▶adjective Architecture having a roof supported by pillars.
– origin C19: from Gk hupostulos, from hupo ‘under’ + stulos ‘column’.
'hypostyle' also found in these Oxford entries:

