The spelling of "most gummed" can be explained using IPA phonetic transcription. The first syllable "most" is pronounced /moʊst/, with the 'o' sound as in 'boat' and the 's' sound as in 'snake'. The second syllable "gummed" is pronounced /ɡʌmd/, with the 'u' sound as in 'cup' and the 'd' sound as in 'dog'. This adjective refers to an object or surface that is covered in a sticky adhesive, hence "most gummed" would mean the most covered or saturated in this substance.