generic noun?

0Hi,02br
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00I was looking at a grammar book and in it it had the following:02br
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01i00The02i00 is not used for the 2nd mention of a generic noun 02br
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00I think an example can be given as this:02br
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01i00What is 01u00an apple02u00? 01u00An apple02u00 is a red fruit that is sweet. 02i02br
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00Would you say that an generic noun is a term used to describe a noun that is used generically or in a general way/sense? 0-