The term 'oven' originates from Sanscrit - as far as we know, but could well7 be from much earlier origins - and comes into English via Greek and Latin. It couldn't be called an Arabic term. The term 'microwave' or 'micro' simply refers to the the use of microwaves, generated by a magnetron, in cooking. The term 'micro oven' itself is part of the English language. As many English terms have gone into other languages, this has very likely happened in the case of microwave ovens, which means while the term is currently English it could also be regarded as belonging to other language systems. Its history (etymology) has no real bearing on its current usage.
Micro means very small. Microwaves have much smaller wavelengths than radio waves. In a way, it is an arbitrary name, since microwaves also have a larger wavelength than visible light. But that's how it goes. Someone thought the wavelength was small enough to deserve that name.
The Arabic word for 'cars' is saiarat and the Arabic spelling is سيارات.
Arabic word for Jewellery
The Arabic word for hurry is "besora'a."
The Arabic word for sky is assamaai
Arabic word for echo
The Spanish word for Arabic is "árabe".
the Arabic word for bread is khubz.
The Arabic word for metal is معدن
The Arabic word for cistern is صهريج.
عدالة is the arabic word of Justice.
The Arabic word for maize is 'الذرة'