Cassubian Kashubian Castillian Spanish casus rectus [Lat. rectus ‘straight’]

Nominative case, as opposed to all other cases, which are grouped together as oblique cases. The image implied by ‘casus rectus’ refers to an upright rod or pole which is declined (inflected) to various degrees ( inflection)

References

case

The use of a rhetorical trope to name some-thing that otherwise has no name, (in contrast to metaphor): e.g. (table) leg. Quintilian called catachresis a ‘necessary misuse.’ Catachresis is often used to name products that are the result of new technology. In Brit. Eng. the crossing-point of several highways is called spaghetti junction. Catachresis is common in advertising slogans such as Spalding, the longest ball, or Molson ‘s dry beer. Many terms now considered proper are catachresis in origin: a leaf (of paper), the foot (of a mountain), balkanization.