Histoma is a biological term that refers to the arrangement of tissues in a particular organism. The word "histoma" is spelled as /hɪstəʊmə/ in IPA phonetic transcription. The first syllable "hist" is pronounced similar to the word "hiss" with a 't' sound at the end. The second syllable "o" is pronounced as in "go" and "ma" is pronounced as in "ma'am." The spelling and pronunciation of "histoma" may be tricky for some due to the various phonetic sounds present in the word.
Histioma, tissue-tumor, a neoplasm formed of one or other variety of tissue atypically arranged.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.