What does similitude mean

It means a quality or state of being similar to something

A striking similitude between the brother and sister now first arrested my attention; and Usher, divining, perhaps, my thoughts, murmured out some few words from which I learned that the deceased and himself had been twins, and that sympathies of a scarcely intelligible nature had always existed between them.

What does the term "similitude" most likely mean, as used in paragraph 23

Which of the following statements best summarize the relationship between the family and literal house of usher

no