say it: TRANG-kwuh-lahyz
tranquilize is a verb meaning "make calm or still". It carries 2 recorded senses.
make calm or still
“quiet the dragons of worry and fear”
cause to be calm or quiet as by administering a sedative to
“The patient must be sedated before the 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 tranquilize 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.