This is the 610th most frequent Icelandic word.
vestri
The Icelandic word "vestri" means "west" or "the western part."
Here 'vesturs' is used as the direction 'west', indicating a direction of travel.
Ég ferðaðist til vesturs síðasta sumar.
I traveled west last summer.
The form 'vesturhluti' demonstrates 'vestur' as a descriptor related to a specific part, here referring to the western region.
Vesturhluti landsins er mjög fallegur.
The western part of the country is very beautiful.
'Vestrastræti' uses 'vestri' in a compound as a proper noun indicating the name of a street, implying it is located in the west part of an area.