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, Irish Standard Time, Western European Summer Time

Encyclopedia: BST

• os trapezium
• os trapezoideum
• os triquetrum
• os zygomaticum
• Osage
• osage orange
• Osage River
• Osaka
• Osaka Bay
• Osama bin Laden
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• Oscan-speaking
• Oscar
• Oscar Fingal O'Flahertie Wills Wilde
• Oscar Hammerstein
• Oscar Hammerstein II
• Oscar Palmer Robertson
• Oscar Robertson
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• eye doctor
• eye dropper