15-Letter Words Containing: E,A,T,E,R,Y

• a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections

• extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds

• the branch of psychiatry concerned with psychological methods

• the treatment of mental or emotional problems by psychological means

• A 150-year anniversary.