mouse• A mouseclick on a menuitem would do it.• a field mouse• Bill Atkinson quickly hacked a driverprogram that allowed the mouse to move a cursor on the computer screen.• It was the mouse that roared, even if the mouse happens to weigh 286 pounds.• The mouse controls a fly swatter.• Heatley stayed until 3.30 a.m., when all of the untreatedmice had died.
mouse2n verb
n1mouse over somethingphrasal verbphr vto use a computermouse to move the cursor over a particular thing on the screen
When you mouse over the menu, the different options appear.
From Longman Business Dictionary
mousemouse /maʊs/ noun (plural mouses or mice /maɪs/) [countableC]COMPUTING