[See 鹽 as the old form]「Cavity within scrutiny, monitoring」and「to be guarded with rod head orifice and poultice netting」both suggest activity at a treatment clinic. SALT has been known as an anti-microbial agent since antiquity:
　「Sea salt is a natural antiseptic and anti-inflammatory that for thousands of years has been used in wound cleansing. Remember the expression, 'throwing salt on a wound?' That's because that's what people actually did to clean out infected cuts, and [scrapes]. It sounds painful, but it can aid in healing to get the area free of infection quicker. …Salt is not only antibacterial, but antiviral, and antifungal as well so there are a variety of cleansing benefits to the salt itself.」
　　[　https://thesaltsuite.com/blog/2019/12/5/how-is-salt-therapy-anti-bacterial/ 2021-10-02　]　
　SALTS are essential for animal life due to their ionization chemical properties, but toxic for nearly all land plants. SALT is one of the basic tastes sensed by human tongues. Without salt all animals will die, but ingesting too much will also kill most animals.「Lying prone with brain fluids over a dish」to collect those fluids for use as gravy (not a joke). Cattle given unlimited access to large salt licks have been known to ingest quantities sufficient to kill the animals, likely by causing a heart attack due to sodium, potassium or other ion imbalances. The same elements also depict「warning to maintain some distance from brain fluid in dish or find yourself prone.」…brain fluid is salty, since sodium ions are essential to enable electrical impulses to pass between synapses within the brain…but too much salty juices also can cause a heart attack, and cave folks probably found out the hard way, in addition to contracting kuru:「Kuru is found among people…who practiced a form of cannibalism in which they ate the brains of dead people…. Kuru causes brain and nervous system changes similar to Creutzfeldt-Jakob disease. Similar diseases appear in cows as bovine spongiform encephalopathy (BSE), also called mad cow disease. The main risk factor for kuru is eating human brain tissue, which can contain the infectious particles. …Death usually occurs within 1 year after the first sign of symptoms.」
　　[　https://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002355/ 2012-12-23　]　
　Concubines used salts in the deep skin slits of their bound feet to accomplish two things at once: dry the skin, and disinfect any wounds or straggling bacteria left by clients.
　「Human cannibals likely took a big bite out of their fellow humans about 10,000 years ago, according to a study that examined prehistoric bones with scratch and bite marks on them. …In the end, they discovered 30 bones belonging to three individuals: a robust adult, a gracile adult and an infant. However, the infant had only one complete bone (a shoulder blade, or scapula) that did not show signs of cannibalism, the researchers said. …But the practice goes way back: there's even evidence of Neanderthal cannibalism in Belgium and Spain from more than 40,000 years ago, when they went extinct, Live Science previously reported.」
　　[　https://www.cbsnews.com/news/prehistoric-human-bones-show-signs-of-cannibalism/ 2017-03-28　]　
　Some browsers will not display this glyph using certain fonts…the actual glyph may possibly be seen within other glyphs as an element.

External source definitions
none located, and you ought to ask yourself, why not?
definition speculated from combining the elements, or, from usage in other glyphs