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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.
lanthanoid is a noun meaning "any element of the lanthanide series (atomic numbers 57 through 71)". It carries one recorded sense.
any element of the lanthanide series (atomic numbers 57 through 71)
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 lanthanoid come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.