Noun
a gastrointestinal hormone that stimulates the secretion of water and bicarbonate from the pancreas and bile ducts whenever the stomach empties too much acid into the small intestine
Source: WordNetIt is released from the pancreas in response to the hormone secretin to neutralize the acidic chyme entering the duodenum from the stomach. Source: Internet
They named this substance " secretin " and coined the term hormone for chemicals that act in this way. Source: Internet