The Vietnamese word "ông vãi" is a noun that translates to "ancestor" in English. It is commonly used to refer to a male ancestor, particularly a grandfather or an elder male relative from previous generations.
In more advanced contexts, "ông vãi" can be used when discussing cultural traditions related to ancestor worship, which is significant in Vietnamese culture. For instance, during the Tết holiday, families often pay respects to their "ông vãi" by making offerings at family altars.
While "ông vãi" primarily refers to male ancestors, it can also be used more broadly to refer to respected older male figures in a community or family, not strictly limited to blood relatives.