1. Occurring ever half hour

1. Every thirty minutes, every half hour

See also: periodic, periodical

• cryolite
• cryometer
• cryonic
• cryonics
• cryopathy
• cryophobia
• cryopreservation
• cryoscope
• cryosphere
• cryostat
• cryosurgery
• crypt
• Cryptacanthodes
• Cryptacanthodes maculatus
• cryptanalysis
• cryptanalyst
• cryptanalytic
• cryptanalytics
• cryptic
• cryptic coloration
• cryptical
• cryptically
• crypto-
• cryptobiosis
• cryptobiotic