12-Letter Words Containing: I,T,R,A,N,A

• retrace one's course

• annihilation by vaporizing something

• the process of becoming a vapor

• an immunosuppressive drug (trade name Imuran) used to prevent rejection of a transplanted organ

• change something so that its value declines; for example, art forms

• declare a child to be illegitimate

• Any quadrivalent chromosome

• Having a valence of four

• (of a vaccine) Protecting against four different (usually flu) viruses.

• Said of a graph: that all of its vertices have degree four.