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say it: RAH-kuh-tree
rocketry is a noun meaning "the branch of engineering science that studies rocket design and operation". It carries one recorded sense.
the branch of engineering science that studies rocket design and operation
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 rocketry 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.