Use colortbl
. I have used blue just to demonstrate as here background is white. You may change blue
to white
(\arrayrulecolor{white}
) in your actual case.
\documentclass{article}
\usepackage{array,multirow,colortbl}
\begin{document}
\arrayrulecolor{blue} %% change blue to white in your case
\begin{tabular}{|c|cc|}\hline
\multirow{4}{*}{Foo} & 1 & 2 \\
& 1 & 2 \\\cline{2-3}
& 1 & 2 \\
& 1 & 2 \\\hline
\multirow{4}{*}{Bar} & 1 & 2 \\
& 1 & 2 \\\cline{2-3}
& 1 & 2 \\
& 1 & 2 \\\hline
\end{tabular}
\end{document}

For details Refer to documentation of colortble
page 5 and 6 sections 7 and 8. To get documentation run texdoc colortbl
from command prompt or visit texdoc.net
Another option is to use xcolor
package with [table]
option:
\documentclass{article}
\usepackage{array,multirow}
\usepackage[table]{xcolor}
\begin{document}
\pagecolor{blue!40} %% just to demonstrate - remove in your file
\arrayrulecolor{white}
\begin{tabular}{|c|cc|}\hline
\multirow{4}{*}{Foo} & 1 & 2 \\
& 1 & 2 \\\cline{2-3}
& 1 & 2 \\
& 1 & 2 \\\hline
\multirow{4}{*}{Bar} & 1 & 2 \\
& 1 & 2 \\\cline{2-3}
& 1 & 2 \\
& 1 & 2 \\\hline
\end{tabular}
\end{document}

Edit:
It works for long tables also:
\documentclass{article}
\usepackage{array,multirow,longtable}
% \usepackage{colortbl}
\usepackage[table]{xcolor}
\usepackage[textheight=10cm]{geometry} %% onlly for testing
\begin{document}
\pagecolor{blue} %% just to demonstrate - remove in your file
\arrayrulecolor{white}
\begin{tabular}{|c|cc|}\hline
\multirow{4}{*}{Foo} & 1 & 2 \\
& 1 & 2 \\\cline{2-3}
& 1 & 2 \\
& 1 & 2 \\\hline
\multirow{4}{*}{Bar} & 1 & 2 \\
& 1 & 2 \\\cline{2-3}
& 1 & 2 \\
& 1 & 2 \\\hline
\end{tabular}
\begin{longtable}{|>{\bf\centering\arraybackslash}p{1in}| p{2in}|}
\hline
\large{Name} & \large{\textbf{Definition}}\\ \hline
\endfirsthead
\hline
\large{Name} & \large{\textbf{Definition}}\\ \hline
\endhead
\hline
\multicolumn{2}{r}{continued \ldots}
\endfoot
\hline
\endlastfoot
Newton's first law & An object will \\ \hline
Newton's second law & The net force \\\hline
Newton's third law & When two bodies \\ \hline
Linear momentum & The product of an object's \\ \hline
Net force on a body & Is said to be equal \\ \hline
Impulse of a force & The product of \\\hline
Principle of conservation of momentum & In a closed system, \\
\hline
Perfectly elastic collision & A collision is \\ \hline
Inelastic collision & A collision is \\ \hline
Radian & $\pi$ radians = $180^\circ$\\ \hline
Gravitational field strength & The gravitational force
\\\hline
Newton's law of gravitation & Any two point masses\\\hline
\end{longtable}
\end{document}

Edit:
For a query in the comment below:
You may use some thing like
\newcolumntype{M}[1]{>{\centering\arraybackslash}p{#1}} %% this needs array package
\begin{longtable}{|M{1.4cm}|M{1cm}|M{1cm}|M{3.7cm}|M{1.8cm}|M{1.8cm}|}
|
and\hline
. If you are using colors forcells/rows/columns
, then you can color them usingcolortbl
package.biblatex
tag since nowhere in your problem did I see something related to it :)