That's almost five times as heavy as the heaviest metal hitherto known.

This one was advanced: more sophisticated in knowledge and application than any hitherto known.

For the first time in his life Ikey found himself at odds with a conscience which he had hitherto not known to exist.

But nothing was hitherto known of their work.

We are now in a land lying outside of time and space as you have hitherto known them.

Lives were changed by the out-of-body experience, hitherto known only to a few drug addicts.

A total contrast to everything which he had known hitherto.

The Festival of that day was far the most sumptuous hitherto known.

This combination of characters is unique, as far is hitherto known.

The 8 hitherto known species fall into 3 groups: