The word "lymphoididity" is not found in any reputable dictionaries and appears to be misspelled. However, one possible explanation for its spelling could be as follows: The initial "lymphoid-" indicates a connection to lymphoid tissue or cells, while the suffix "-idity" suggests a state or quality. The final "-ity" is typically pronounced with stress on the second syllable (i-TEE), while the preceding "o" sound is often reduced to a schwa (uh). Therefore, the IPA transcription of this hypothetical word might be /ˌlɪmˈfɔɪdədɪti/.
A state in which lymphoid characteristics are present.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.