Septunx is not a frequently used word, but it does have an intriguing spelling. It is spelled s-e-p-t-u-n-x, with the stress falling on the first syllable. The IPA phonetic transcription for this word is /ˈsɛptʌŋks/. The "sept" part comes from the Latin word for "seven," which is "septem," while "unx" is a Latin word for "ounce." As such, we can interpret "septunx" as a unit of measure equivalent to seven ounces.