The following definitions were taken from : Blood DC, Studdert VP. Saunders Comprehensive Veterinary Dictionary. 2nd ed. Toronto: WB Saunders. 1999.

amyloid plaques – starch-like material deposits.
astrogliosis – inflammation of the astroglia, a neuroglial tissue.
ataxia – failure of muscular coordination and irregularity of muscle action.
cortical blindness – due to a lesion of the optic cortex of the brain; the pupillary light reflex still functions.
dementia – loss of intellectual capacity accompanied usually by irrational behaviour.
dura mater – the outermost, toughest and most fibrous of the three membranes (meninges) covering the brain and spinal cord.
enterocytes – predominant cell type of the in the small intestine mucosa. They are tall, columnar cells responsible for the final digestion and absorption of nutrients,         electrolytes and water.
enzootic – present constantly in a location.
histopathology – histology is the component of anatomy dealing with the minute structure, composition and function of tissues. Histopathology deals with this in             reference to studying disease.
hyperesthesia – a state of abnormally increased sensitivity to stimuli.
hypermetria – ataxia in which movements overreach the intended goal.
immunohistochemistry – denoting the application of antibody-antigen interactions to histochemical techniques, as in the use of immunofluorescence.
lymphocytes – a mononuclear, nongranular leukocyte (white blood cell) having a deeply staining nucleus containing dense plasma. It participates in immunity.
myoclonus – repetitive, rhythmic contractions of a group of skeletal muscles, persisting in sleep.
necropsy – examination of the body after death.
neurodegeneration – selective degeneration of neurons.
pathognomonic – specifically distinctive or characteristic of a disease or pathological process/condition; denoting a sign or other indicant on which a diagnosis can         be made.
polydipsa – excessive thirst manifested by excessive water intake.
proteases – any proteolytic enzyme, an enzyme that breaks down proteins.
pruritus – itching.
tertiary – third in order, with reference to protein structure it is the unique structure made up of secondary structure elements (such as alpha helices and beta
        sheets) folded in a specific way to determine the three-dimensional, biologically-active conformation of a protein.
vacuolar – containing, or of the nature of, vacuoles: a space of cavity in the cytoplasm of a cell.
zoonotic – disease of animals that is transmissible to humans.

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