Droid

Droid is a shorten form of the word 'Android' and was first used in Star Wars Episode IV A New Hope. It was conceived as slang akin to how 'copper' was shortened to 'cop' in relation to law enforcement officers in the United States of America. It has since become a trademark of Lucasfilm. The term "Droid" has been licensed under Lucasfilm by Verizon Wireless for their line of smartphones based on the Android operating system. Motorola's late-2009 Google Android-based cell phone is called the Droid and this line of phone has been expanded to include other Android-based phones released under Verizon.

Trademark
As a Trademark of Lucasfilm it is protected legally from use by any commercial endeavor by any company other then Lucasfilm. For example, the the game BattleTech was originally called BattleDroids but the name was changed due to Lucasfilm holding the rights to the term. The Incredibles, a 2004 feature film features an adversary known as the Omnidroid, and the credits give a nod to Lucas film for the use of the term droid.