1. A form of daylight-saving time, one hour ahead of UTC, used in the United Kingdom, Ireland and mainland Portugal in summer
   - British Summer Time, BST, Western European Summer Time

Encyclopedia: Irish Standard Time

• cat's-paw
• cat's-tail
• cat-o'-nine-tails
• cata-cornered
• catabatic
• catabatic wind
• catabiosis
• catabolic
• catabolise
• catabolism
• catabolize
• Catacala
• catachresis
• catachrestic
• catachrestical
• cataclinal
• cataclysm
• cataclysmal
• cataclysmic
• catacomb
• catacorner
• catadromous
• catafalque
• Cataflam
• Catalan