How to automate a dictionary (sorting, headers)?

Here is a piece of solution to automate a dictionary using the links given in the first following comments.

There are two problems to solve :

• When one definition starts on one page and finishes on another, the words in the headinga are not the good ones. In my example below, take a look at the page 1 where the last word must be adhesive and not adhesion, and in the page 2, the first word must be adjacent and not adhesive. Is there a way to solve this problem ?
• Secundly, I would like the letter A of the section to be centerd using \textbf{\textsf{...}} for formatting.

Here is the code that I've wanted to improve.

% Sources : % 1) http://tex.stackexchange.com/questions/30392/how-could-one-setup-a-layout-for-a-dictionary-if-possible % 2) http://tex.stackexchange.com/questions/26122/indexing-an-interval-of-words-on-top-of-every-page \documentclass[twoside]{article} \usepackage{multicol} \usepackage{ifthen} \usepackage{fancyhdr} \usepackage{enumerate} \usepackage{lipsum} % Empty \sectionmark \renewcommand{\sectionmark}[1]{} \fancyhead[L]{\textsf{\rightmark}} \fancyhead[R]{\textsf{\leftmark}} \fancyfoot[C]{\textbf{\textsf{\thepage}}} % Entry command : \dict{<word>}{<gender>}{<text>} \newcommand{\dict}[3]{% \par\vspace{0.25\baselineskip} % \textbf{\textsf{#1}} \textit{#2} #3 % \markboth{#1}{#1} } \pagestyle{fancy} \begin{document} \section*{A} \begin{multicols}{2} \dict{adequate}{n}{\lipsum[1]} \dict{adhere}{n}{\lipsum[2]} \dict{adherence}{n}{\lipsum[3]} \dict{adhesion}{n}{\lipsum[4]} \dict{adhesive}{n}{\lipsum[5]} \dict{adjacent}{n}{\lipsum[6]} \dict{adjective}{n}{\lipsum[1]} \dict{adjoin}{n}{\lipsum[2]} \dict{adjourn}{n}{\lipsum[3]} \dict{adjournment}{n}{\lipsum[4]} \dict{adjunt}{n}{\lipsum[5]} \dict{adjust}{n}{\lipsum[6]} \end{multicols} \end{document} 

The solution found is the following one even if there is one remaining disturbing behavior, even if it is logical : in the last page of the output of the following code, zero appears in both headers...

% Sources : % 1) http://tex.stackexchange.com/questions/30392/how-could-one-setup-a-layout-for-a-dictionary-if-possible % 2) http://tex.stackexchange.com/questions/26122/indexing-an-interval-of-words-on-top-of-every-page % 3) http://tex.stackexchange.com/questions/30947/how-to-automate-a-dictionary-sorting-headers/31017#31017 \documentclass[twoside]{article} \usepackage{multicol} \usepackage{fancyhdr} \usepackage[bf,sf,center]{titlesec} % Headers and footers \fancyhead[L]{\textsf{\rightmark}} \fancyhead[R]{\textsf{\leftmark}} \fancyfoot[C]{\textbf{\textsf{\thepage}}} \renewcommand{\headrulewidth}{1.4pt} \renewcommand{\footrulewidth}{1.4pt} % Entry command : \dict{<word>}{<gender>}{<text>} \newcommand{\dict}[3]{% \markboth{#1}{#1}% \par\vspace{0.25\baselineskip}% \textbf{\textsf{#1}} \textit{- #2 -} #3% } \pagestyle{fancy} % For testing \usepackage{lipsum} \begin{document} \section*{A} \begin{multicols}{2} \dict{adequate}{n}{\lipsum[1]} \dict{adhere}{n}{\lipsum[2]} \dict{adherence}{n}{\lipsum[3]} \dict{adhesion}{n}{\lipsum[4]} \dict{adhesive}{n}{\lipsum[5]} \dict{adjacent}{n}{\lipsum[6]} \dict{adjective}{n}{\lipsum[1]} \dict{adjoin}{n}{\lipsum[2]} \dict{adjourn}{n}{\lipsum[3]} \dict{adjournment}{n}{\lipsum[4]} \dict{adjunt}{n}{\lipsum[5]} \dict{adjust}{n}{\lipsum[6]} \end{multicols} \section*{M} \begin{multicols}{2} \dict{main}{n}{\lipsum[3]} \dict{material}{n}{\lipsum[1]} \dict{mathematic}{n}{\lipsum[2]} \dict{more}{n}{\lipsum[2]} \end{multicols} \section*{Z} \begin{multicols}{2} \dict{zebra}{n}{\lipsum \lipsum \lipsum} \dict{zero}{n}{\lipsum[4]} \end{multicols} \end{document}