P Ex7:12 :ܘܐܪܡܝܘ ܓܒܪ ܚܘܛܪܗ ܩܕܡ ܦܪܥܘܢ ܘܗ݂ܘܘ ܬܢܝ̈ܢܐ‏ : they each threw down their staff before Pharaoh and they became serpents
See the entire entry for tannīn, tannīnā n.m. sea serpent