Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
nanophthalmos is a noun meaning "condition in which both eyes are abnormally small but otherwise normal". It carries one recorded sense.
condition in which both eyes are abnormally small but otherwise normal
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 nanophthalmos come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.