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ACROSS
1)  a neutral achromatic color midway between white and black
2)  a star that ejects some of its material in the form of a cloud and become more luminous in the process
3)  (physics and chemistry) the smallest component of an element having the chemical properties of the element
4)  a common cyst of the skin; filled with fatty matter (sebum) that is secreted by a sebaceous gland that has been blocked


DOWN
1)  bite or chew on with the teeth
2)  memorization by repetition
3)  a river in southwestern england rising in gloucestershire and flowing through bristol to empty into the estuary of the severn
4)  edible tuber of any of several ____

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gray
nova
atom
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