The word "Stilar" may seem like an odd spelling at first glance, but it actually follows the rules of English phonetics. The pronunciation of "Stilar" is best represented phonetically as [stɪlɑr]. The "st" at the beginning is pronounced as in "stop", while the "i" is pronounced like the "i" in "sit". The second syllable, "lar", is pronounced with the "a" sounding like the "a" in "car". So while the spelling may seem unconventional, the pronunciation of "Stilar" is quite straightforward.
Pert. to the style of a dial.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.