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say it: PEN-uh-tray-tur
penetrator is a noun meaning "an intruder who passes into or through (often by overcoming resistance)". It carries one recorded sense.
an intruder who passes into or through (often by overcoming resistance)
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 penetrator 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.