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Related Clues:
- Austrian physicist Ernst
- __ 1 (speed of sound)
- Presidents of the United States of America: "___ 5"
- Presidents of the United States of America "___ 5"
- Queen attire in "I Want To Break Free"
- "Kind of a ___"
- Play slower than normal tempo
- Play too slow
- Iconic k.d. lang album of covers
- — Number relates to speeds
- Eponymous physicist Ernst
- Jet speed word
- Sound-barrier word
- Jet speed number
- Ernst for whom a speed measure is named