"Xenomorph"

Technically, the word means "a strange or foreign shape or structure" so I think it was quite an exotic use of the word by the writer of the movie in this case. And yes, it has really stuck as the name of the alien species. Took me a bit of effort to get past Alien-related search results in Google!

Yeah it really bugs me too , especially when people use the tern in real life to refer to the alien(s) characters of the film.

Just mentioned once , in a throwaway line , and the audience is all like "ooh now we know the scientific name , lets use that forever"

It doesn't bug me, I always thought it was a good name for the Alien, and the name fits especially considering how little they knew about it (strange shape). However, Weyland-Yutani obviously knew more than they told the Colonial Marines, and who knows what they told Gorman and maybe even some of the other soldiers behind the scenes.

I was more fascinated by Hudson's "another bug hunt" back and forth throwaway.

Hudson:
Is this going to be a standup fight, sir, or another bughunt?

Gorman:
All we know is that there is still is no contact with the colony, and that a xenomorph may be involved.

Frost:
Excuse me sir, a what?

Gorman:
A xenomorph.

Hicks:
It's a bughunt.

Yes. It's very annoying.

Agreed.

Also, these creatures should get an official classification and name.

I hated how the term was introduced. He pulled it out of his ass.