He spent most of 1939 trying to grow more pure versions of the crystals.

The Calo they spoke was, by all accounts, the purest version of the Gypsy language extant.

The 1975 definition was an exceptionally pure version that had not been current previously and only lasted a year or two.

There are many examples, but the purest and most original version comes from the original "Terminator" movie, which came to the screen in 1984.

He described the sound of his version of "I Care" as "maybe a little more pure version of it".

OxyContin is a pure, high-strength version of a long-used narcotic, oxycodone.

Dealers just went on dealing, not only lowering their prices but also selling stronger, purer versions of heroin, cocaine and marijuana.

In corrupted form, it was said, much different from the pure version Luthair Paendrag brought.

When the researchers succeeded in making purer versions of these materials, however, even though superconductivity came more suddenly, the hints at the higher temperatures did not appear.

An even purer version of this experience would be to listen to Homer, originally meant for only the ear.