Broca’s aphasia
Definition - A type of aphasia where you can understand speech but you can't produce speech.
Note: It results from injury to the Broca area which is in the front-left hemisphere of the brain.

Example -

Etymology -
The area of the brain was named for the French surgeon and anthropologist Pierre Paul Broca (1824–80) who was the first to notice its relationship with aphasia.

Oxford English Dictionary -
Though the condition has been associated with the Broca area since the 19th century, the phrase's first citation is from 1907:
"In the Aphasia of Broca … the cases … closely resemble those of Wernicke's aphasia, with the difference that, in Broca's aphasia, the patient cannot speak."
(Practitioner Oct. 545)

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