Definition of "nonraven"

Similarly, there are various ways of gathering the data that something is a nonblack nonraven.

1982, Paul Horwich, Probability and evidence, page 60

Let us return to the hypothesis that generated the paradox: All nonblack things are nonravens.

2001, Peter Achinstein, The book of evidence

Hempel remarks that if we know that we are indoors, and so that the object under examination is a nonraven, then we have no need to check whether it is nonblack (ie, to do ornithology indoors) in order for our report of that object to logically entail H's development.

2007, Marc Lange, Philosophy of science: an anthology