The term "Musk" as is used in our industry can mean different things to different people. It depends upon your knowledge of the word, how the term was used and its intention of use.
Tonquin Musk is a familiar name that has long been recognized in our industry for many decades. Most likely the term Musk has been adopted by many to help in various descriptions of materials or products over the years. It can be a good fit term in some cases however in other cases it may be an empty word with little to no real meaning of value to any great degree.
Literally the term is usually associated with a material or excretions that are derived from a specific animals known prime selective reproductive DNA identifying producing glands, specific specie trait musk/scent developing glands and/or excretions from such glandular body organ/parts.
Some common species in our industry with musk's and extractable essence materials that come to mind are mink, muskrat, skunk and members of these families. Canines and felines have anal glands containing excretions for feces lubrication,urine and specie DNA markers left of who they are so to speak. These identifying scent markers are key components of communication for wildlife and domestic animal species.
In general terms the word "Musk" can mean a more broader and loosely used form of the word. It can mean that the use of any materials that may fall under this category and blended with other ingredients formulating a specific product. This product is containing some form of active materials representing these specific named extractions or similar such materials derived from by products obtained from a specific animals musk or musk containing body parts in that product.
Currently we are dealing with more man made or synthetic forms of various glands, musk's and essential oils then ever before. Chemistry and pharmaceutical companies have made significant advances in these fields. In liquid, powder, crystal and active ingredients held in a gum binder form or the actives are sold in some other neutral base to hold a less pure active ingredient state.
Some active natural derived musk's or man made materials require some sort of processing incorporating age, grinding, heat, solvents and astringent/cutting oils to extract and hold these actives to allow their use for sale or for distribution use in a formula.
Hence the term "Musk" can mean what a seller is generally attaching to a products name in such a manner to describe the product or to help to create a KEY word interest to sell a product.
Sorry, I guess I got a bit carried away. Just my thoughts on this topic.