tinman
nounEtymology In allusion to the character Tin Man from the Land of Oz, who lacked a heart.
1
An uncaring or heartless man; a man lacking, or seeming to lack, feelings, emotions, or concern for others.
2
Biology, Genetics, Medicine, Natural sciences, Sciences A master gene in the fruit fly Drosophila melanogaster, whose absence causes the fly to develop without a heart.
- Tinman belongs to a special class of genes. [...] But some genes make proteins that control other genes. Some act like master switches, triggering many different genes to work together to build a structure. Tinman is one such “master gene” for the fruit fly.2000, Carl Zimmer, “The Hidden Unity of Hearts”, in Natural History, volume 109, number 3, archived from the original on 07 Jan 2009, pages 56–61: