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say it: ER-speed
airspeed is a noun meaning "the speed of an aircraft relative to the air in which it is flying". It carries one recorded sense.
the speed of an aircraft relative to the air in which it is flying
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for airspeed come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.