15-Letter Words Containing: O,C,H,A,E,T,A

• The use of pharmaceuticals to treat disease

• The fused head and thorax of spiders and crustaceans

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

• providing a chart or outline of a system

• the act of reducing to a scheme or formula

• the operation of introducing a catheter into the body