Ms. Plut. 73.16, medication-education

[bi3mw]

I don't know about the three nymphs: could it be the name of a spring? 

Perhaps it is also a pagan thing. In Greek mythology, for example, there are the so-called Naiads. These were minor goddesses (nymphs) of rivers, streams, lakes, marshes, fountains, and springs.
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Three nymphs on a relief from Aquae Iasae (an ancient Roman settlement with thermal baths, now in northern Croatia).
   

Consecration for the nymphs, “Nymphas Salutares” (the healing nymphs)
   
Nymphas salutares / M(arcus) Rutilius Lupus tr(ibunus) mil(itum) / leg(ionis) XXII q(uaestor)
tr(ibunus) pl(ebis) / leg(atus) Aug(usti) leg(ionis) XIII Gem(inae)