Describe a table

I've looked in a bunch of places (include the describe.c as suggested
in the FAQ; I'm just really rusty on my C and as such got nothing from
the code) on how to 'describe' a table.  In MySQL, I could simply use
the command:

desc tablename;

What is the command in pgsql?
I apologize for the stupid question but I've spent the last several hours
looking for the stupid answer. :P

thnx,
Chris