Traject \Tra*ject"\, v. t. [imp. & p. p. {Trajected}; p. pr. & vb. n. {Trajecting}.] [L. trajectus, p. p. of trajicere to throw across; trans across + jacere to throw. See {Jet} a shooting forth.] To throw or cast through, over, or across; as, to traject the sun's light through three or more cross prisms. [R.] --Sir I. Newton.