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say it: NEP-toon
neptune is a noun meaning "(Roman mythology) god of the sea; counterpart of Greek Poseidon". It is pronounced /ˈnɛptun/ — NEP-toon. It carries 2 recorded senses.
a giant planet with a ring of ice particles; the 8th planet from the sun is the most remote of the gas giants
“the existence of Neptune was predicted from perturbations in the orbit of Uranus and it was then identified in 1846”
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 neptune 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.