be·ta-thal·as·se·mia or ß-thalassemia or Brit be·ta-thal·as·sae·mia or ß-thalassaemia -.thal-ə-'sē-mē-ə n thalassemia in which the hemoglobin chain designated beta is affected and which comprises Cooley's anemia in the homozygous condition and thalassemia minor in the heterozygous condition
Medical dictionary. 2011.