1. Pertaining to the hypothetical upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere; celestial; as, ethereal space; ethereal regions. Go, heavenly guest, ethereal messenger. (Milton)
2. Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterised by extreme delicacy, as form, manner, thought, etc. Vast chain of being, which from god began, natures ethereal, human, angel, man. (Pope)
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... cell walls are strong, porous, flexible, and biodegradable. Tinkering further, he found that crystals would seed themselves and grow within the ethereal threads. With the soft structure of the fibers as a matrix, minerals evolved into crystalline networks, (some people have reported crystal-like ...
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