The word "agnostid" is a term used in the field of paleontology to describe a type of trilobite that lived during the Ordovician period. The spelling of "agnostid" is pronounced as /æɡˈnɒstɪd/ (ag-NAH-stid) with emphasis on the "ag" syllable. The first "g" is pronounced as a hard "g" sound, and the "o" is pronounced as a short vowel sound. The final "id" is pronounced as "id" with a short "i" sound. Overall, the phonetic transcription of "agnostid" aids in properly spelling and pronouncing this specialized term in the field of paleontology.