H3551 כַּו (kav)

KJV renderings: window.
Strong's definition: a window (as a perforation)
Derivation: (Aramaic) from a root corresponding to H3854 (לַהַג) in the sense of piercing;

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