This is the 10167th most frequent Spanish word.
científico
Scientist.
Here, 'científico' is used as a noun to refer to a person who is engaged in scientific research.
El científico trabaja en un laboratorio.
The scientist works in a laboratory.
In this case, 'científico' is an adjective that describes the approach as being related to science.
Adoptaron un enfoque científico para resolver el problema.
They adopted a scientific approach to solve the problem.
Here, 'científico' modifies 'libro' as an adjective, indicating the book covers scientific topics.