xi /zī, ksī or ksē/

1. The fourteenth letter of the Greek alphabet (Ξ or ξ), corresponding to X
2. As a numeral ξˈ = 60, ˌξ = 60000

• oak galls
• oakier
• oakiest
• oak-leaf
• oak-leaf cluster
• oak-leaf clusters
• oak leather
• oak leathers
• oak-leaves
• oakling
• oaklings
• oak lump
• oak lumps
• oak mast
• oak masts
• oak-nut
• oak-nuts
• phrasy
• phratries
• phratry
• phreak
• phreaking
• phreakings
• phreaks
• phreatic