plethysmograph
noun
ple·thys·mo·graph ple-ˈthiz-mə-ˌgraf 
plə-
: an instrument for determining and registering variations in the size of an organ, limb, or part resulting from changes in the amount of blood present or passing through it
plethysmographic
ple-ˌthiz-mə-ˈgra-fik
adjective plə-
plethysmographically
ple-ˌthiz-mə-ˈgra-fi-k(ə-)lē
adverb plə-
plethysmography
ˌple-thiz-ˈmä-grə-fē
noun plə-
Example Sentences
Recent Examples on the Web Offenders could be required to submit to plethysmograph testing, in which sensors are attached to their penis, in an effort to find out whether they were aroused by deviant imagery and sounds. 
Christopher N. Osher, The Denver Post, 5 Mar. 2017
Christopher N. Osher, The Denver Post, 5 Mar. 2017 Word History
Etymology
International Scientific Vocabulary, from Greek plēthysmos increase, from plēthynein to increase, from plēthys mass, quantity, from plēthein
First Known Use
1872, in the meaning defined above
Medical Definition
plethysmograph
noun
ple·thys·mo·graph -ˌgraf
: an instrument for determining and registering variations in the size of an organ or limb resulting from changes in the amount of blood present or passing through it
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