Highbrow tower material?
I believe the answer is:
ivory
(Other definitions for ivory that I've seen before include "Substance of elephant's tusk" , "Piano key" , "What tusks are made of" , "Some hunt this" , "Key material" .)
I believe the answer is:
ivory
(Other definitions for ivory that I've seen before include "Substance of elephant's tusk" , "Piano key" , "What tusks are made of" , "Some hunt this" , "Key material" .)