How can I check for events from a host in a list of "critical hosts"?

I have a list of hosts; I need to see if these hosts appear anywhere in my Splunked events. It is a very long list, so I don't want to type a search like this: host=a.domain.com OR host=b.xyz.com OR .... Is there a better way? [I feel certain that this question has been asked and answered before, many times - but I simply could not find it in Answers. My apologies if it duplicates.]