Crossword puzzle clue "hr related to airspeed"

Here are the possible solutions for hr related to airspeed clue

Answer
Clue
Relevancy
eta
Clue
Hr. related to airspeed
Definition
a Greek letter
mach
Clue
Airspeed ratio
Airspeed measure
Airspeed number
Definition
a number relating the speed of a body to the speed of sound
machmeter
Clue
Airspeed ratio indicator
Definition
an instrument for measuring Mach number
ablaut
Clue
Vowel change in related words
Definition
(German) vowel change in related words, esp. that in Indo-European, which survives in English in e.g. sing, sang, sung, song
acne
Clue
Oil-related problem
Definition
a skin disease caused by inflammation of the sebaceous follicles, esp. on the face, neck, and shoulders
acoustic
Clue
Sound-related
Definition
a sense of hearing

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