noun suffix
( -s )
Etymology: New Latin, probably from originally nonsignificant -a in magnesia, from Medieval Latin -a (in magnesia, alchemical substance), from Greek -a, -ē (in magnēsia, magnēsiē, alchemical substance, magnet), from nominative singular feminine adjectival ending corresponding to nominative singular masculine -os and nominative singular neuter -on
: oxide
ceri a
lanthan a
thori a