[damnfine]

If one dimension is limited compared to others, it makes sense to call it psudeo 3d, because all planes are not fully realized. But it is still clearly invoking a 3rd dimension, maybe a 4th if you consider movement in time.

I still call it just shy of '3D'.

[wlesieutre]

My car is 3D but it's only ever car-shaped.

[thanatropism]

Yes, but can it be segmented in open regions which are homeo/diffeomorphic to subsets of the R²?

(Canonical example: the Earth is a three-dimensional object, but looks 2D locally (at a neighborhood of any given point).

[Geee]

Offtopic, but why is 'pseudo' almost always misspelled even on HN?

[pluma]

Because in English the way it's spelled seems entirely orthogonal to its pronunciation.

"pseudo" basically sounds like "sudo".

Compare to German where the way it's spelled is exactly how you'd spell it if you first heard it (and speak German). We don't drop the "p" and we pronounce "eu" as a diphthong as in other Germans words (sounding like "oi" in English).

As a German this is why I almost never misspell it in English. It looks the same as in German and is a loanword in both languages, so I tend to sound it out the German way even when thinking in English.