Search theta theta /thē″tə, thā″tə/ , Θ, θ, the eighth letter of the Greek alphabet. Tweet Telegram VK Random Words emmetropia angiofibroma velocardiofacial syndrome magnesium silicate (MgSiO3) cementoblastoma respiratory component (αPCO2) human papillomavirus (HPV) test ephaptic transmission zoomania