LOCUS CLASSICUS Meaning of LOCUS CLASSICUS in English [locus clas.si.cus] n, pl loci clas.si.ci [NL] (1853) 1: a passage that has become a standard for the elucidation of a word or subject 2: a classic case or example Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012