say it: may
mei is a noun meaning "Japanese ornamental tree with fragrant white or pink blossoms and small yellow fruits". It carries one recorded sense.
Japanese ornamental tree with fragrant white or pink blossoms and small yellow fruits
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 mei 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.