A tableux is a frozen image uded in drama to show the whole play, or summary of of the play quickly, using only 4 or 5 tableux to express it.
Irregular plurals are formed in several ways, based generally on the language of origin. Sometimes a modern English regular plural will come into use. *See longer list at the related link* -is to -es : analysis/analyses, axis/axes, basis/bases -an to -en : man/men, woman/women added -en : child/children, ox/oxen -eau to -eaux (French): tableau/tableux -um to -a (Latin) : bacterium/bacteria, datum/data, medium/media -a to -ae (Latin) : nova/novae, alga/algae, vertebra/vertebrae -on to -a or -ia (Latin): phenomenon/phenomena, criterion/criteria -us to -i : alumnus/alumni, radius/radii oo to ee : foot/feet, goose/geese Sometimes there is no change between the singular and plural: deer, moose, sheep / series, species