ultrametric adjective 2noun 1forms 1 adjective2 •Describing a metric whose triangle inequality has the stronger form d(x,z)< max d(x,y),d(y,z). •Describing a phylogeny in which every tip is the same distance from the root. noun1 •A metric whose triangle inequality has the stronger form d(x,z)< max d(x,y),d(y,z). formsultrametrics