biol. The zone of an ocean or sea into which light does not penetrate and in which, therefore, photosynthesis cannot take place. It is usually below about 100 m. འོད་རྒྱུད་འཕྲོ་མི་བྱེད་པའི་རྒྱ་མཚོ་དང་མཚོ་ཡི་ཁུལ་ལ་གོ་ཞིང་། […]
phil. The period in Europe from the fall of Rome in the fifth century ad to the restoration of relative political stability around the year 1000; the early part of […]