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

• achromats
• Achtung
• achy
• ACIB
• aciclovir
• aciclovirs
• acicular
• aciculate
• aciculated
• acid
• acidanthera
• acidantheras
• acid drop
• acid drops
• acid dye
• acid dyes
• acider
• acidest
• acid freak
• acid freaks
• acid-head
• acid-heads
• acid house
• acid-house
• acidic