cycasin
noun
cy·ca·sin ˈsī-kə-sən 
: a glucoside C8H16N2O7 that occurs in cycads and results in toxic and carcinogenic effects when introduced into mammals
Example Sentences
Recent Examples on the Web While every part of this is plant is toxic and pets should not come into contact with one at all, the seeds contain a larger amount of the toxin, cycasin, than other parts of the plant. 
Traci Howerton, NOLA.com, 7 Oct. 2020 For says there’s a compound in the plant called cycasin that can cause liver necrosis. Cathy M. Rosenthal, chicagotribune.com, 6 Sep. 2019 All parts of the plant contain a neurotoxin called cycasin, which can be deadly – even in tiny amounts – to dogs and cats. Kim Campbell Thornton, sacbee, 14 Mar. 2018
Traci Howerton, NOLA.com, 7 Oct. 2020 For says there’s a compound in the plant called cycasin that can cause liver necrosis. Cathy M. Rosenthal, chicagotribune.com, 6 Sep. 2019 All parts of the plant contain a neurotoxin called cycasin, which can be deadly – even in tiny amounts – to dogs and cats. Kim Campbell Thornton, sacbee, 14 Mar. 2018 Word History
Etymology
New Latin Cycas cycad + International Scientific Vocabulary -in entry 1
First Known Use
circa 1965, in the meaning defined above
Medical Definition
cycasin
noun
cy·ca·sin ˈsī-kə-sən
: a glucoside C8H16N2O7 that occurs in cycads and results in toxic and carcinogenic effects when introduced into mammals