The term 'splitting of hairs' is a phrase used to describe an overly meticulous or pedantic approach to a task. It is often used to describe someone who is overly concerned with minor details and nuances, often to the point of being unreasonable. The crossword solutions for this term are 'PORE' and 'QUIB'. PORE means to read or study something carefully and quib means to make petty or trivial objections. Together, these two words provide an apt description of the phrase 'splitting of hairs'.