Definition of epistylium in US English:

epistylium

(also epistylion)

noun

Architecture
  • The lowest division of the entablature, consisting of the main beam that rests immediately upon the abacus on the capital of a column.

Origin

Mid 16th century; earliest use found in John Shute. From classical Latin epistȳlium architrave.

Pronunciation

epistylium

/ɛpɪˈstʌɪlɪəm/