say it: sidz
sids is a noun meaning "sudden and unexpected death of an apparently healthy infant during sleep". It carries one recorded sense.
sudden and unexpected death of an apparently healthy infant during sleep
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 sids 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.