runting
/ˈrʌntɪŋ/noun
1The stunting of the growth or development of an animal or plant; the birth or development of animals that are small for their kind, especially (in later use) in the contexts of laboratory breeding and intensive rearing.
2 Slang. In the ice-cream trade: the practice of giving unaccompanied children undersized portions. rare.
Origin
Late 19th century; earliest use found in The Garden. From runt + -ing.