ethereal [ɪˈθɪriəl]
adj
Ethereal means "of or relating to the regions beyond the earth" or "of or resembling heaven." It can also mean "lacking material substance" and "relating to, containing, or resembling a chemical ether."
The ancient Greeks believed that the heavens and its denizens were made of a purer, less tangible substance known (in English transliteration) as either quintessence or ether. Ether was often described as an invisible light or fire;
English
Optimized studying based on the forgetting curve vastly improves memorization. - What is reminDO?
Memorize
