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Noun - [[focus]]
[[Image:lighterstill.jpg]][[Image:Foci.jpg|right|frame|<center>Formation of nuclear "foci"</center>]]
Plural - countable and uncountable; '''foci''' or focuses
Noun - [[focus]], Plural - countable and uncountable; '''foci''' or focuses
*1. (countable) (optics) a point at which reflected or refracted rays of light converge.
*1. (countable) (optics) a point at which reflected or refracted rays of light converge.
*6. (countable) the exact point of where an earthquake occurs, in three dimensions.
*6. (countable) the exact point of where an earthquake occurs, in three dimensions.
The earthquake's focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground.[http://en.wiktionary.org/wiki/focus]
The earthquake's focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground.[https://en.wiktionary.org/wiki/focus]
[[Category: General Reference]]
