H3539 כַּדְכֹּד (kad-kode')

KJV renderings: agate.
Strong's definition: a sparkling gem, probably the ruby
Derivation: from the same as H3537 (כַּד) in the sense of striking fire from a metal forged;

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