-ˌjīd, -_jə̇d noun
( -s )
Etymology: German fulgid, from fulg- (from Latin fulgēre ) + -id -ide
1. : the anhydride C 6 H 4 O 3 of fulgenic acid
2. : a derivative of fulgenic acid (as some aryl derivatives used in photography to produce removable light images in blue and black tones)