Where are user-defined types stored/viewed

After I execute a command like

CREATE TYPE employee_wage_journal_sum AS (supplier_pk integer,
        employee_pk integer,
        hourly_dollars double precision,
        annual_dollars double precision);

where does this definition get stored, and what query can I run to get
teh definition back as output?

I don't see the new type show up anywhere in pgAdminII.

The new type DOES show up in the result when I run

select * from pg_type order by typname

but I see only the name itself (and a lot of "*id" columns that probably
reference something relevant), but I don't know how to get the actual
definition back so that I can use an existing type definition as the
basis for modification when application design changes are required.

~Berend Tober