here's a word that didn't show up at m-w, but I found this on info-please:

ap•as•tron

Pronunciation: (u-pas'trun, -tron),
—n.,
—pl. -traPronunciation: (-tru). Astron.
the point at which the stars of a binary system are farthest apart (opposed to periastron).

I picked up the word from this site:
http://www.fourmilab.ch/gravitation/orbits/

pretty interesting stuff!


formerly known as etaoin...