Main Entry: Cas·tel·la·ni's paint Pronunciation: "kas-t&-"län-Ez-'pAnt Function: noun :CARBOLFUCHSIN PAINT Casátelálaáni/"kas-t&-'län-E,/Aldo(1878–1971),Italian physician. Castellani was a specialist in tropical diseases. His numerous contributions to tropical medicine include the discovery in 1903 of a species of trypanosome (Trypanosomagambiense) in the spinal fluid of patients suffering from sleeping sickness, the discovery in 1905 that yaws is caused by a spirochete (Treponema pertenue), and the isolation of new strainsof fungi causing dermatoses.