We don't have synonyms for gilgie yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are gillie and gilgit.
(n) :
(Australia, Western Australia) Either of two small freshwater crayfish, Cherax quinquecarinatus and Cherax crassimanus, endemic to the south-west corner of Australia.
(n) :
(Australia, Western Australia) Either of two small freshwater crayfish, Cherax quinquecarinatus and Cherax crassimanus, endemic to the south-west corner of Australia.