Final answer:
Hydrocephalus is the term that describes the abnormal accumulation of CSF in the brain's ventricles, which can lead to increased intracranial pressure and neurological issues.
Step-by-step explanation:
The word that means an abnormal accumulation of cerebrospinal fluid (CSF) in the ventricles of the brain is hydrocephalus. This condition occurs when there is a disruption in the production, flow, or absorption of CSF, leading to increased pressure inside the skull. As CSF accumulates, it can cause the ventricles to enlarge and press against the brain tissue, potentially leading to neurological problems, such as seizures or cognitive issues.
Hydrocephalus can be a serious condition and, in some cases, may require the insertion of a shunt to drain excess fluid and relieve pressure. The term arises from the Greek words 'hydro' meaning water and 'cephalus' meaning head, referring to the buildup of water-like CSF in the brain's ventricles.