Psychological Disorders List - Symptoms and Diagnosis. This psychological disorders list and directory has been abbreviated from the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV). This manual is the most widely used diagnostic criteria for the classification of psychological disorders. Adjustment Disorders.
pest â(plural pests). ( 1 originally) A plague, pestilence, epidemic. 2  An annoying, harmful, often destructive creature. 3  An annoying person.( 4 Britain, slang) Someone with poor social discipline who continually bothers uninterested women.est â(plural pests). ( 1 originally) A plague, pestilence, epidemic. 2  An annoying, harmful, often destructive creature. 3  An annoying person.
Contrast with singular. Although the English plural is commonly formed with the suffix-s or-es, the plural of some nouns (such as sheep) is identical in form to the singular (see zero plural), while some other nouns (such as dust) have no plural form. See Examples and Observations below. Here are some other interesting examples of nouns that have identical singular and plural forms: three aircraft (spacecraft, hovercraft, etc.)six head of cattle Look up aircraft and head (as in of cattle) in a dictionary to see what they say about the origins of these words and the likely reasons for their forms.