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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
sulcus is a noun meaning "(anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain". It carries one recorded sense.
(anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain
anatomy
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 sulcus come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.