say it: PEN-juh-luhm
pendulum is a noun meaning "an apparatus consisting of an object mounted so that it swings freely under the influence of gravity". It carries one recorded sense.
an apparatus consisting of an object mounted so that it swings freely under the influence of gravity
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 pendulum 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.