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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
gibbousness is a noun meaning "something that bulges out or is protuberant or projects from its surroundings". It carries one recorded sense.
something that bulges out or is protuberant or projects from its surroundings
“the gun in his pocket made an obvious bulge”
“the hump of a camel”
“he stood on the rocky prominence”
“the occipital protuberance was well developed”
“the bony excrescence between its horns”
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 gibbousness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.