underground:- نطاق من القشرة الأرضية تحت السطح الخارجى للأرض تدرس ظواهره الجيولوجية وبخاصة الظواهر الطبيعيه والتركيبية بوساطة الحفر أو باستخدام الطرق الجيوفيزيقية المختلفة. (معجم الجيولوجيا)
underground:- conducted with or marked by hidden aims or methods (Princeton WordNet 3.1)
underground:- an electric railway operating below the surface of the ground (usually in a city) (Princeton WordNet 3.1)
underground:- a secret group organized to overthrow a government or occupation force (Princeton WordNet 3.1)
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