9. The following compounds form their plurals thus: handful,
handfuls; cupful, cupfuls; spoonful, spoonfuls:--brother-in-law,
brothers-in-law; court-martial, courts-martial.
The following words form their plurals according to the rules of the
languages from which they are adopted.
_Singular_ _Plural._
Antithesis antitheses
Apex apices
Appendix appendixes _or_ appendices
Arcanum arcana
Automaton automata
Axis axes
Basis bases
Beau beaux _or_ beaus
Calx calces _or_ calxes
Cherub cherubim _or_ cherubs
Crisis crises
Criterion criteria
Datum data
Diaeresis diaereses
Desideratum desiderata
Effluvium effluvia
Ellipsis ellipses
Emphasis emphases
Encomium encomia _or_ encomiums
Erratum errata
Genius genii [2]
Genus genera
Hypothesis hypotheses
Ignis fatuus, ignes fatui
Index indices _or_ indexes [3]
Lamina laminae
Magus magi
Memorandum memoranda _or_ memorandums
Metamorphosis metamorphoses
Parenthesis parentheses
Phenomenon phenomena
Radius radii _or_ radiuses
Stamen stamina
Seraph seraphim _or_ seraphs
Stimulus stimuli
Stratum strata
Thesis theses
Vertex vertices
Vortex vortices _or_ vortexes
[2] Genii, imaginary spirits: geniuses, persons of great mental
abilities.
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