The word "steelest" is spelled with the letters s-t-e-e-l-e-s-t. In IPA phonetic transcription, the word is pronounced as /stiːlɛst/. The "ee" sound represents the long vowel "i" and the "st" sound is pronounced with a voiceless "s" sound followed by a tense "t" sound. The "-est" ending indicates the superlative form of the adjective "steel," indicating that something is the most steel-like or made of the most steel.