The word "Splenish" is a rare word in the English language that has roots in Old French. It is used to describe the act of enriching or adding to something. Interestingly, the word is pronounced with a silent "p" sound, making it sound like "slenish." In IPA phonetic transcription, it is represented as /splɛnɪʃ/. Despite being infrequently used, "Splenish" is still recognized as a valid English word and can be found in some literary works.