Definition of "ALL"

ALL

noun
countable and uncountable, plural ALLs
1. (anatomy) Initialism of anterolateral ligament.
2. (oncology, hematology) Initialism of acute lymphoblastic leukemia.
  Quotations
  In children, leukemia was most commonly ALL—lymphoblastic leukemia—and was almost always swiftly lethal.
  2010, Siddhartha Mukherjee, The Emperor of All Maladies, Fourth Estate (2011), page 17