The word "Glumal" is spelled with a unique combination of sounds which can easily confuse readers unfamiliar with the word. Its phonetic transcription is /ɡluməl/. The first syllable "glu" is pronounced with a hard "g" and a "loo" sound, while the second "mal" sounds similar to "mull." The word, however, does not have any recognized definition or origin, and is likely to be a made-up word or an alternative spelling of an existing one.
Having a glume.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.