high-grade

top-quality adjective surpassing in quality; `top-grade ore`
Found on http://wordnetweb.princeton.edu/perl/webwn?s=high-grade

High-grade

Credit quality of AAA or AA.
Found on http://www.duke.edu/~charvey/Classes/wpg/bfglosh.htm

high-grade

(hi´grād´) occurring near the high end of a range, as of a malignancy.
Found on http://www.encyclo.co.uk/local/21001
No exact match found