Is “Hotspot” a Scrabble word?

1.An optical phenomenon which creates a bright spot around the shadow of the viewer's head, when the surface on which the shadow falls has special optical characteristics (as with dewy grass).

1.A place notable for a high level of activity or danger.

2.A part of an application that consumes a significant amount of execution time.

3.Part of a control that responds dynamically as the user moves the pointer over it, as for example in an image map.