Gier'-ea`gle noun [ Confer Dutch gier vulture, German gier , and English gyrfalcon .] (Zoology) A bird referred to in the Bible ( Lev. xi. 18 and Deut. xiv. 17 ) as unclean, probably the Egyptian vulture ( Neophron percnopterus ). Found on http://www.encyclo.co.uk/webster/G/26