Abarim Publications' online Biblical Hebrew Dictionary
The root-verb כתר (katar) means to surround. It's used only a few times in the Bible: Judges 20:43, Psalm 22:13, Job 36:2. It also occurs in Psalm 142:7 in a verse that's difficult to translate. This verb's derivatives are:
- The masculine noun כתר (keter), meaning crown. This word occurs only in the book of Esther and is considered of late origin.
- The verb כתר (katar), meaning to crown. This verb comes from the previous noun.
- The feminine noun כתרת (koteret), also spelled כותרת (koteret), denoting the capital of a pillar — perhaps as surrounding or crowning its top, suggests BDB Theological Dictionary.