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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ulna is a noun meaning "the inner and longer of the two bones of the human forearm". It carries one recorded sense.
the inner and longer of the two bones of the human 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 ulna come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.