psycholinguistics
noun
psy·cho·lin·guis·tics ˌsī-kō-liŋ-ˈgwi-stiks 
plural in form but singular in construction
: the study of the mental faculties involved in the perception, production, and acquisition of language
psycholinguist
ˌsī-kō-ˈliŋ-gwist
noun psycholinguistic
ˌsī-kō-liŋ-ˈgwi-stik
adjective 
Example Sentences
Recent Examples on the Web The results supported the psycholinguistics hypothesis, with center-embedding presenting the greatest comprehension difficulty for readers. 
Jennifer Ouellette, Ars Technica, 15 Sep. 2022 To illustrate the absurdity—and long history—of this notion, linguists often retell the ancient story of the Greek historian Herodotus, who in about the fifth century B.C. wrote about an ancient psycholinguistics experiment. Katherine D. Kinzler, Scientific American, 6 Aug. 2020
Jennifer Ouellette, Ars Technica, 15 Sep. 2022 To illustrate the absurdity—and long history—of this notion, linguists often retell the ancient story of the Greek historian Herodotus, who in about the fifth century B.C. wrote about an ancient psycholinguistics experiment. Katherine D. Kinzler, Scientific American, 6 Aug. 2020 Word History
First Known Use
1936, in the meaning defined above
Medical Definition
psycholinguistics
noun, plural in form but singular in construction
psy·cho·lin·guis·tics ˌsī-kō-liŋ-ˈgwis-tiks
: the study of the mental faculties involved in the perception, production, and acquisition of language