Rhinoculin is a non-existent word, and as such, its spelling cannot be accurately determined. However, if we were to assume that it is a compound word made up of "rhino" and "cillin," we can make some assumptions about its pronunciation. "Rhino" is pronounced as "raɪnoʊ" (rye-noh) and "cillin" as "sɪlɪn" (sih-lin). Therefore, if we combine the two, the hypothetical pronunciation of "rhinoculin" would be "raɪnoʊsɪlɪn" (rye-noh-sih-lin).
Trade name of an ointment containing a local anesthetic, asserted to be non-toxic, recommended in the treatment of hay-fever.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.