The word "lymphocerastism" is a rare medical term used to describe the excessive growth of lymphoid tissue. In terms of spelling, it can be broken down into three parts: "lympho-", meaning lymphoid or lymphatic, "-cerast-", meaning growth, and "-ism", meaning a condition or disease. The pronunciation of this word is /lɪmfoʊˈsɛrəstɪzəm/ with emphasis on the "ser" syllable. Due to its technical nature, this word is not commonly used in everyday speech.
The process of formation of lymphoid cells.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.