say it: KYOO-bit
cubit is a noun meaning "an ancient unit of length based on the length of the forearm". It carries one recorded sense.
an ancient unit of length based on the length of the forearm
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 cubit 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.