The Collaborative International Dictionary
Northern spy
Northern \North"ern\, a. [AS. nor[eth]erne.]
Of or pertaining to the north; being in the north, or nearer to that point than to the east or west.
-
In a direction toward the north; as, to steer a northern course; coming from the north; as, a northern wind.
Northern diver. (Zo["o]l.) See Loon.
Northern lights. See Aurora borealis, under Aurora.
Northern spy (Bot.), an excellent American apple, of a yellowish color, marked with red.
Wikipedia
Usage examples of "northern spy".
At Atlanta when he unguardedly said he was fresh from Philadelphia, he barely escaped lynching, being taken for a Northern spy.