Relating to or characteristic of an architrave, the lowest division of an entablature that rests directly on a column in classical architecture.
From Italian 'architrave' (from 'archi-' meaning chief + 'trave' meaning beam), combining Greek 'archi-' (chief, principal) with Latin 'trabs' (beam). The term evolved to describe the principal beam or molded frame around a doorway or window.
Architraval is a word that mostly lives in architecture textbooks and exists to make adjectives from architectural terms—it's the kind of specialized vocabulary that shows how English creates descriptive forms for highly technical fields, even when those forms are rarely used.
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