To what effect? Astronomy is full of terms. Why not tell us your purpose and maybe we can narrow it down to something intelligent as well as intelligent sounding.
heres some websites for some terms:
http://www.solarviews.com/eng/terms.htm
http://www2.jpl.nasa.gov/basics/bsfgloss.htm
http://www.seasky.org/astronomy/astronomy_glossary.html
http://www.enchantedlearning.com/subjects/astronomy/glossary/