Crossword puzzle clue "extremely high speed"

Here are the possible solutions for extremely high speed clue

Answer
Clue
Relevancy
mach
Clue
Extremely high speed
Definition
a number relating the speed of a body to the speed of sound
asimov
Clue
Writer who said "I am not a speed reader. I am a speed understander"
altissimo
Clue
Extremely high, in music
Definition
(Italian) very high
blackholes
Clue
They have extremely high gravitational fields
iqs
Clue
Mega Society members have extremely high ones
rarefied
Clue
Extremely high or elevated, as air
Definition
RAREFY, to make less dense, also RARIFY
spike
Clue
Extremely high heel
steep
Clue
Extremely high, as prices

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