Accusativus Graecus

[Shine]

[face=SPIonic]Xai=re[/face]
Can anyone explain what is Accusativus Graecuss and when it is used?
[face=SPIonic]Xa/rin e)/xw[/face]

[Emma_85]

[face=spionic]o(\s peri\ me\n no/on e)sti\ brotw~n[/face]
,who is superior to humans in intellect.

The accusive here is an accusative of relation.

[Shine]

Still not clear enaugh
[face=SPIonic]e(ij a)gorh\n kale/santa ka/rh komo/wntaj A)xaiou\j[/face] (Odussey 1:90)
[face=SPIonic]h(=sto ga\r e)n mnhsth=rsi fi/lon tetihme/noj h(=tor[/face] (Odussey 1:114)
Could those examples be an Acc Graecus?

[Skylax]

In your first example, the Accusativus Graecus is [face=SPIonic]ka/rh[/face] "heads" : it is about the Achaeans, long-haired "as far as their heads were concerned" (i. e. we say nothing about their legs...)

You are right in the second example : Ulysses is sorrowful "as far as his heart is concerned" (maybe not his reason).

Other example :
[face=SPIonic]Sku/qhj to\ ge/noj[/face] "Scythian by his race" (maybe not by his habits)

By the way, the name Accusativus Graecus was given by Latin-speaking people, because Latin expresses it more often by means of the ablative.