H5646 עָב (awb)

KJV renderings: thick (beam, plant).
Strong's definition: an architrave (as shading the pillars)
Derivation: or עֹב; from an unused root meaning to cover; properly, equivalent to H5645 (עָב); but used only as an architectural term,

From James Strong's public-domain dictionaries (H), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.