Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
asterism is a noun meaning "(mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light". It carries 2 recorded senses.
(mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light
mineralogy
(astronomy) a cluster of stars (or a small constellation)
astronomy
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 asterism come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.