leukaemia(A progressive, malignant disease of the blood forming organs; a distorted proliferation and development of leukocytes and their precursors in the blood and bone marrow)
lexicon(The vocabulary of a particular sphere of activity, region, social class or individual, or the total set of morphemes or meaningful units of a language and its words)
dragonfly(Any of the insects composing six families of the suborder Anisoptera and having four large, membranous wings and compound eyes that provide keen vision)
