Some thoughts on this topic (please forgive my newbiness as this is
the beginners list :)
Each of those definitions (at least the ones that are indeed quite
different) could/should have a different word in lojban. So, if your
intention is to state a structure made of triangles, use that type of
word. If your intention is to state a spherical structure of struts,
then a word could be for that.
I'm sorry, I'm new here, but tell me this... if someone knew all the
basic vocabulary and the rules for creating new words, would they have
a good chance of knowing what rekyboldi'u means without any context
when they see it for the first time? What about with context?
I would think one of the wonderful benefits of lojban is that you can
do this--create a word that is very precise in what you mean. Granted,
that would mean an enormous vocabulary, thus my question--can someone
decompose a word they've never seen before and most likely understand
what it should mean?