ground, floor, the Earth = (ard) الأَرْض

Associated verb: أَرُضَ (يَأْرُضُ) – أَرَاضَة to be thriving (said of land); to be humble, of a good disposition (said of a person)
Plurals: أَرَاضٍ ، أَرْضُوْنَ

Examples

الله الّذِي خَلَقَ سَبْعَ سَمَاوَاتٍ وَمِنَ الْأَرْضِ مِثْلَهُنّ يَتَنَزّلُ الْأَمْرُ بَيْنَهُنّ لِتَعْلَمُوا أَنّ الله عَلَى كُلّ شَيْءٍ قَدِيرٌ وَأَنّ الله قَدْ أَحَاطَ بِكُلّ شَيْءٍ عِلْمًا God it is who has created seven heavens, and of the earth the like thereof. The commandment comes down among them slowly, that you may know that God is Able to do all things, and that God surrounds all things in knowledge. – Quran, 65:12

عَنِ ابْنِ عُمَرَ عَنِ النّبِيّ صَلّى الله عَلَيْهِ وَسَلّمَ قَالَ : مَنْ أَخَذَ شَيْئًا مِنَ الأَرْضِ ظُلْمًا خُسِفَ بِهِ إِلى سَبْعِ أَرْضِينَ On the authority of Ibn Umar, who narrated from the Prophet, God bless him and grant him peace, “Whoever usurps any land wrongfully, he will be swallowed up through the seven Earths.” – Musnad Ahmad

هُلْ لا تَزَالُ أَمْرِيكا أَرْضُ أَحْلاَمِ الْمُهاجِرِ الْعَرَبِي Is America still the land of dreams for the Arab immigrant – BBC News, Arabic

Did you know…

The word أَرْض is considered to be a collective generic noun, like شَجَر and بَقَر . In other words, it refers to a plural, and one may form the singular by adding a ة ; so, a tree is شَجَرَة , and a cow is بَقَرَة . However, the Arabs don’t use أَرْضَة , and it is not found in the records of classical Arabic writing. A collective generic plural may be used to refer to a singular noun where the context makes it clear, and that seems to be the case with the use of أَرْض . It should be noted that there is a verse in the Quran (quoted above), and there are several ahadith, which refer to seven Heavens and seven Earths, the latter now often understood as referring to the layers of the Earth below us. The use of the word أَرْض for Earth seems to be very appropriate then, as the Earth is a single body (and the collective generic noun can be used as a singular), but composed of many layers (and the collective generic noun is usually used to refer to a plurality).