13-Letter Words Containing: I,S,T,R,A,I,T

• attempting to justify or defend in speech or writing

• providing justification

• the production or use of theories

• the reduction of the value of an asset by prorating its cost over a period of years

• payment of an obligation in a series of installments or transfers

• the act of motorizing (equipping with motors or with motor vehicles)

• a physician who specializes in psychiatry

• the act of making an organism barren or infertile (unable to reproduce)

• the procedure of making some object free of live bacteria or other microorganisms (usually by heat or chemical means)