Hypertext Webster Gateway: "hyperthyrion"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Hyperthyrion \Hy`per*thyr"i*on\, n. [NL., fr. Gr. ?; "ype`r over
+ ? door.] (Arch.)
That part of the architrave which is over a door or window.
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