The phrase "hallmark feature" means a distinctive or defining characteristic of something that is easily recognizable or associated with it. Full definition
Likewise, unregulated growth, abnormal cell division, and defective cell death pathways are hallmark features of tumors. (mdanderson.org)
Other hallmark features don't exist in the Google Edition. (digitaltrends.com)
Boosting levels of a specific protein in the brain alleviates hallmark features of Alzheimer's disease in a mouse model of the disorder, according to new research published online August 25, 2016 in Scientific Reports. (sciencedaily.com)