\def\termform{\line{\hfil {\it Vocabulary} \hfil}\smallskip}
\edef\terms{\termform}
\def\term#1#2{\let\oldterms\terms \edef\terms{\oldterms\par{\bf #1}: #2}}
\def\maketerms{\smallskip\hrule\smallskip\terms \edef\terms{\termform}}