Abbott-Smith Manual Greek Lexicon
μῆκος (G3372)
3 μῆκος , -εος ( -ους ), τό , [in LXX chiefly for אֹרֶךְ ;] length : Eph 3:18 , Re 21:16 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain
Strong's G3372 · Greek
μῆκος
mekos · may'-kos
probably akin to 3173; length (literally or figuratively) length. see GREEK for 3173