Here's why it's not a short vowel word:
* The first syllable "mi" has a long "i" sound. This sound is created by a vowel followed by a consonant, which in this case is "n."
* The second syllable "nus" also has a long "u" sound. This sound is created by a vowel followed by a consonant, which in this case is "s."
Short vowel words have a short, quick vowel sound followed by a consonant. Examples of short vowel words include: cat, dog, man, run, and sit.