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90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.
Cells in the brain shrink during sleep, increasing the size of the interstitial space, the gaps between brain tissue, and allowing more fluid to be pumped in and wash the toxins away.
to fall over forwards so that your face hits the ground or another surface
not skilful or sensitive
the activity of exploring abandoned buildings and other manmade structures
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American definition and synonyms of interstitial from the online English dictionary from Macmillan Publishers Limited.