BRITAIN. The informal name for the United Kingdom.Compare with the following from here.
BRITISH is the formal designation of the nationality of citizens of the United Kingdom, and of certain others.
The adjective "British" is, of course, used in relation to Great Britain but there is also a common tendency to use it when referring to issues relating to both Great Britain and the United Kingdom. This is inaccurate and from a legal point of view erroneous. [emphasis mine]
Sometimes, however, in legislation the term "British" is used to refer to the United Kingdom as a whole, especially in matters relating to the question of nationality.
At one point Wikipedia suggests that Britain might be used for the island alone, and Great Britain for England, Scotland & Wales (ie including the Isle of Wight, Anglesey and so on), but it doesn't give a source for this, and I'm not sure why anyone except geographers would need such a distinction.
Anyway, our next is ABSTRACT, containing ANIMAL and VEGETABLE with a small amount of MINERAL.