Merci. I'll give it a try later on today.
But if, having done so, I can't cut-and-paste the symbol (and therefore have to go through those machinations each and every time I need x-macron), it won't be a true solution.

By the bye, I notice that PubMed (et al) replaces the symbol with the phrase "x with macron" whenever it appears in scientific publications ... which raises the issue that if it can be printed in journals, ... [well, you get the idea].

I also assume that your instructions are the standard method for using UTF-8 code. Correct me if I'm wrong.

EDIT:
Hot snot! (Forgive the expression.)
It worked ... although when holding down the alt key and typing (what appears to be +0305), nothing appears on the line; when alt key released, the following showed up: xÌ… . (Does it render ~ show up when I cut-and-paste it in this reply? It does for me here, as well as in other documents.)

Last edited by grelber; 03/21/12 01:17 PM. Reason: It works!