The correct spelling for "Houstons muscle" is actually "Houston's muscle." The apostrophe indicates possession and the letter "s" indicates a singular noun. In terms of pronunciation, "Houston" is pronounced as /ˈhjuːstən/ and the word "muscle" is pronounced as /ˈmʌsl/. The stress falls on the first syllable of "Houston" and the second syllable of "muscle". Therefore, when spoken together, the correct pronunciation is /ˈhjuːstənz ˈmʌsl/.
There is no commonly known dictionary definition for the term "Houstons muscle." It appears to be a phrase that does not have a widely recognized or established meaning. It could potentially be a specific term or reference used within a particular context, industry, or community that is not widely known. In such cases, the meaning may be best understood by referring to the specific context or seeking clarification from the source or individuals who use the term. It is important to note that dictionaries often do not include very specific or niche phrases, so if "Houstons muscle" is a rare or specific term, it may not have a dictionary definition. However, without further context or information, it is not possible to provide an accurate definition for this phrase.