The word "most acerous" is spelled with the phonetic transcription /moʊst eɪˈsɛrəs/. The use of the letter 'o' in 'most' is pronounced with the long vowel sound /oʊ/, and the second syllable in 'acerous' uses the short 'e' sound followed by the 'r' sound. The word 'acerous' means lacking in horns or antlers. The combination of these words in a sentence can describe a particular animal species, such as a most acerous deer.
The term "most acerous" does not have a clear etymology, as it is not a commonly used word or phrase. "Acerous" itself is derived from the Latin word "acer", meaning "sharp" or "keen", combined with the suffix "-ous", which forms an adjective meaning "full of" or "characterized by". Therefore, "acerous" would typically relate to something that is sharp or keen. However, the phrase "most acerous" seems to be a specific combination that may not have a well-established origin or meaning.