The spelling of the word "Trompil" can be explained using the International Phonetic Alphabet (IPA). The first syllable "trom" is pronounced with a voiced alveolar trill [tɹɒm]. The second syllable "pil" is pronounced with a voiceless bilabial plosive [pɪl]. Together, "Trompil" is pronounced as [tɹɒmpɪl]. While the meaning of the word "Trompil" is unknown, understanding its phonetic transcription can aid in proper pronunciation and spelling.
An aperture in a tromp.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.