What is "aega psora"

Salve \Salve\ (?; 277), n. [AS. sealf ointment; akin to LG. salwe, D. zalve, zalf, OHG. salba, Dan. salve, Sw. salfva, Goth. salb[=o]n to anoint, and probably to Gr. (Hesychius) ? oil, ? butter, Skr. sarpis clarified butter. [root]155, 29

1. ] 1. An adhesive composition or substance to be applied to wounds or sores; a healing ointment.
   --Chaucer.

2. A soothing remedy or antidote.

   Counsel or consolation we may bring. Salve to thy sores.
   --Milton.

   Salve bug (Zo["o]l.), a large, stout isopod crustacean ( [AE]ga psora), parasitic on the halibut and codfish, -- used by fishermen in the preparation of a salve. It becomes about two inches in length.

Aega psora is a species of isopod crustacean that parasitises a number of fish species in the North Atlantic. It is a serious ectoparasite of larger species of fish, particularly when they are injured.