The spelling of the word "Endosmosmic" can be explained using the International Phonetic Alphabet (IPA). "Endo" is pronounced as /ˈɛndoʊ/, meaning inside or within. "Smosmic" is pronounced as /smɑːzmɪk/, with the "sm" indicating a combination of the consonant sounds "s" and "m". "Smosmic" refers to an osmotic process occurring within a closed system, such as a cell. Thus, "Endosmosmic" can be defined as the movement of fluid or particles from outside to inside a cell or other container through osmosis.