a neoplasm of lymph tissue that is usually malignant; one of the four major types of cancer
"The patient was diagnosed with lymphoma, a serious form of cancer affecting the body's immune system."
A malignant tumor that arises in the lymph nodes or in other lymphoid tissue.
"The patient was diagnosed with a rare form of non-Hodgkin's lymphoma after doctors detected abnormal growths in his cervical lymph nodes."
In plain English: Lymphoma is cancer that starts in your immune system's lymph nodes and other parts of your body that fight infection.
"The doctor diagnosed him with lymphoma after finding an unusual lump in his neck."
From lymph, from Latin lympha ("water") + -oma ("disease, morbidity").