(C19 Britain) A boy who cleans boots and shoes. / (1970s Britain slang) One of a gang of violent hooligans who usually wear short-cropped hair and bovver boots.

(uncountable) Extreme attention to minute or irrelevant detail. / (countable) A minor detail or circumstantial matter.

A group of one or more species derived from a sequential development pattern which involves continual and uniform changes from an extinct ancestral form on an evolutionary scale.

(science fiction) An inhabitant of Sirius.