aster.ium N 3 1 GEN P M
aster, asteris N (3rd) M [XAXNO] Pliny
plant (Aster amellus?); kind of Samian clay; star (= astrum), destiny (?);
asteri.um N 1 1 GEN P F uncommon
asteria, asteriae N (1st) F [XXXNO] Pliny
precious stone, either asteriated (star) sapphire or cymophane (cats-eye)?;
asteri.um N 1 8 GEN P M uncommon
asterias, asteriae N M [XAXNO] Pliny
bird like heron; kind of heron (L+S);
asteri.um N 2 8 GEN P N uncommon
asterion, asterii N N [XAXNO] Pliny
venomous spider;

Credits:
This, our local install of the popular standby Whitaker's Words, is possible thanks to the resurrection of the venerable project at William Whitaker's Words, where you will also find extensive documentation. The corresponding GitHub repository is where you can submit issues about missing forms and analyses.
This web interface by Walter M. Shandruk.