The spelling of the word "Splenculus" can be explained through the International Phonetic Alphabet (IPA). The word is pronounced /spɪˈlɛŋkjʊləs/ where the "splen-" prefix refers to the spleen and the "-culus" suffix means small. The middle consonant cluster "-nc-" is commonly used in Latin-based words like "sincerely" and "concern." The vowel sound represented by "u" is pronounced as "uh" in "under." Therefore, "Splenculus" refers to a small structure similar to the spleen.
Splenule, an accessory spleen.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.