This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A ball mounted in a stationary housing and rotated to control a pointer on a computer screen.

n. A pointing device consisting of a ball housed in a socket

n. an electronic device consisting of a rotatable ball in a housing; used to position the cursor and move images on a computer screen

"For that alone I am glad the trackball is there .... akbar56"

electronic device   

blackball   

mmp19-deficient    immunodeficient    SCID    knitter    Mickey    non-obese    3galt-deficient    knock-in    trackpad    woodlice