say it: SEE-muh
sima is a noun meaning "rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesium". It carries one recorded sense.
rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesium
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 sima 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.