I've killed hundreds to keep you safe and undiscovered, and I'll kill hundreds more.
The chief of his other contributions to optics was the explanation of the rainbow - an explanation far from complete, since the unequal refrangibility of the rays of light was yet undiscovered - but a decided advance upon his predecessors, notably on the De radiis visas et lucis (1611) of Marc-Antonio de Dominis, archbishop of Spalato.
When that is done, colchicine may be found to exhibit a definite chemical interaction with this hitherto undiscovered substance.
It is conjectured, not without some reason, that there is a connexion, as yet undiscovered, between the Colossal and the Mammoth caves.
He left the library and Traveled to one of the remaining, undiscovered safe houses at the base of one of the mountains.