This is the 538th most frequent Armenian word.
հյդ
The word "հյդ" does not have a meaning in Armenian; it may be a typo or incorrect spelling.
In this sentence, "այդ" is used as a demonstrative adjective meaning "that," referring to a specific book.
Այդ գիրքը շատ հետաքրքիր է։
That book is very interesting.
Here, "այդ" is used as a demonstrative adjective describing "պահին" (moment). It emphasizes a particular moment in time.
Արդյո՞ք այդ պահին դու այնտեղ էիր։
Were you there at that moment?
In this sentence, "այդ" refers to "մարդկանց" (people) to indicate specific individuals.