core ⪢⪢
the center of something
http://qindex.info/i.php?x=13361
 core ⪢⪢
The rings of a tree start forming at its core.
http://qindex.info/i.php?x=19448
◎◎◎ coronavirus ⪢⪢
Coronaviruses are a large group of viruses. They consist of a core of genetic material surrounded by an envelope with protein spikes. This gives it the appearance of a crown. 'Crown' in Latin is called 'corona' and that's how these viruses get their name.
http://qindex.info/i.php?x=7205
 base core
The easiest way to tell if your pans have an iron base core, is to use a magnet.
http://qindex.info/i.php?x=16527
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