We don't have synonyms for keramic yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ceramic, Ceramic and keratic.
(adj) :
Dated form of ceramic. [Made of material produced by the high-temperature firing of inorganic, nonmetallic rocks and minerals.]
(n) :
Dated form of ceramic. [(uncountable) A hard, brittle, inorganic, nonmetallic material, usually made from a material, such as clay, then firing it at a high temperature.]
(adj) :
Dated form of ceramic. [Made of material produced by the high-temperature firing of inorganic, nonmetallic rocks and minerals.]
(n) :
Dated form of ceramic. [(uncountable) A hard, brittle, inorganic, nonmetallic material, usually made from a material, such as clay, then firing it at a high temperature.]