uraniscus

[ yoo r-uh-nis-kuh s ]
/ ˌyʊər əˈnɪs kəs /

noun, plural u·ra·nis·ci [yoo r-uh-nis-ahy] /ˌyʊər əˈnɪs aɪ/. Architecture.

a starlike ornament, as in a coffer of a ceiling.

Origin of uraniscus

< Greek ouranískos ceiling, equivalent to ouran(ós) heaven + -iskos diminutive suffix