skirret

from WordNet (r) 3.0 (2006)

skirret
    n 1: an Asiatic herb cultivated in Europe for its sweet edible
         tuberous root [syn: {skirret}, {Sium sisarum}]

from The Collaborative International Dictionary of English v.0.48

Skirret \Skir"ret\, n. [A corrupted form equivalent to
   sugarwort.] (Bot.)
   An umbelliferous plant ({Sium Sisarum} syn. {Pimpinella
   Sisarum}). It is a native of Asia, but has been long
   cultivated in Europe for its edible clustered tuberous roots,
   which are very sweet.
   [1913 Webster]