Definition of gridiron noun from the Oxford Advanced Learner's Dictionary
gridiron
noun
ˈɡrɪdaɪən ˈɡrɪdaɪərn
1a frame made of metal bars that is used for cooking meat or fish on, over an open fire: (figurative) streets laid out in a gridiron pattern2(North American English) a field used for American football marked with a pattern of parallel lines
ˈɡrɪdaɪən 
ˈɡrɪdaɪərn 
