birr¹ /bûr or bir/ (esp Scot and US)

1. Impetus, force, vigour
2. A violent push (Scot)
3. Emphasis, stress in speaking
4. Any sharp whirring sound

To whirr

• triennially
• triennials
• triennium
• trienniums
• trier
• trierarch
• trierarchal
• trierarchies
• trierarchs
• trierarchy
• triers
• tries
• trieteric
• triethyl
• triethylamine
• triethylamines
• trifacial
• trifacial nerve
• trifacial nerves
• trifarious
• trifecta
• trifectas
• triff
• triffer
• triffest