antithesis
automaton
basis
crisis
ellipsis
hypothesis
parenthesis
phenomenon
thesis

[Sidenote: _Anglicized words._]

When the foreign words are fully naturalized, they form their plurals
in the regular way; as,--

bandits
cherubs
dogmas
encomiums
enigmas
focuses
formulas
geniuses
herbariums
indexes
seraphs
apexes


[Sidenote: _Usage varies in plurals of letters, figures, etc._]