Definition of thymoma in English:
 thymoma
nounPlural thymomata, Plural thymomas ˈθʌɪməʊməTHīˈmōmə
Medicine A rare, usually benign tumour arising from thymus tissue and sometimes associated with myasthenia gravis.
 Example sentencesExamples
-  Among the topics discussed are how to code gastrointestinal sarcomas and malignant lymphomas, as well as malignant thymomas.
 -  At this point the differential diagnosis included thymoma, teratoma and lymphoma.
 -  About 45% of thymomas are associated with myasthenia gravis.
 -  The majority of thymomas are benign, and patients have a survival rate equal to that of the general population.
 -  Rare cases of thymomas, thymic carcinomas, and lymphomas have been reported.
 
Origin
  
Early 20th century: from thymus + -oma.