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

• crystallises
• crystallising
• crystallite
• crystallites
• crystallitis
• crystallitises
• crystallizable
• crystallization
• crystallize
• crystallized
• crystallizes
• crystallizing
• crystallogenesis
• crystallogenetic
• crystallographer
• crystallographers
• crystallographic
• crystallographically
• crystallography
• crystalloid
• crystalloids
• crystallomancy
• crystal meth
• crystal rectifier
• crystal rectifiers