Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
rockcress is a noun meaning "noxious cress with yellow flowers; sometimes placed in genus Sisymbrium". It carries 2 recorded senses.
noxious cress with yellow flowers; sometimes placed in genus Sisymbrium
any of several rock-loving cresses of the genus Arabis
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 rockcress come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.