(literally) a scentless flower / (literary) Synonym of 雪 (yuki, “snow”) (precipitation)

(fiction) Hanahaki, an illness affecting those consumed by unrequited love that manifests as the coughing up of flowers, which clears up upon reciprocation. A fictional illness, it has found popularity among both Japanese and foreign online fanfic (especially) artists and authors for its poetic quality.

(relativity) the theory of relativity

(rare) duality

influenza

corrosion resistance

(medicine) venereal disease (VD), sexually transmitted disease (STD)

(algebra) homogeneity

radioactive element

(psychiatry) bipolar disorder; manic depression