The second stanza of Sappho's *Poem 16* is reconstructed as follows:

> 
> πάγχυ δ' εὔμᾱρες σύνετον πόησαι  
> 
>  πάντι τοῦτ', ᾱ γὰρ πόλυ **περσκέθοισα**  
> 
>  κάλλος ἀνθρώπων Ἐλένᾱ τὸν ἄνδρα  
> 
>  τὸν πανάριστον
> 
> 
> 

I'm mostly familiar with Attic, but trying to branch out into other dialects. Most of the unfamiliar Aeolian words are fairly easy to figure out: for instance, *πόησαι* is Attic *ποίησαι*, and *ᾱ* is Attic *ἡ*.

But I'm unsure what to do about *περσκέθοισα*. LSJ lists no stems starting with *persk-*, nor with *peri-sk-*. What word does this come from? And what form is it?