brain meaning
EN
[bɹeɪn] [-eɪn] 
US WBrain
- The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals.
- Physiologically, the function of the brain is to exert centralized control over the other organs of the body.
- The operations of individual brain cells are now understood in considerable detail but the way they cooperate in ensembles of millions is yet to be solved.
- This article compares the properties of brains across the entire range of animal species, with the greatest attention to vertebrates. It deals with the human brain insofar as it shares the properties of other brains.
- NounPLbrainsSUF-ain
- The control center of the central nervous system of an animal located in the skull which is responsible for perception, cognition, attention, memory, emotion, and action.
- Irregular bedtimes may disrupt healthy brain development in young children, according to a study of intelligence and sleeping habits.  ¶ Going to bed at a different time each night affected girls more than boys, but both fared worse on mental tasks than children who had a set bedtime, researchers found.
- INF An intelligent person.
- He was a total brain.
- (please add the primary text of this usage example) He is the brains behind the scheme.
- (in the plural) Intellect.
- (please add the primary text of this usage example) Gerald always acts like he doesn't have a brain.
- By analogy with a human brain, the part of a machine or computer that performs calculations.
- The computer's brain is capable of millions of calculations a second.
- SLA (vulgar) oral sex.
- The control center of the central nervous system of an animal located in the skull which is responsible for perception, cognition, attention, memory, emotion, and action.
- VerbSGbrainsPRbrainingPT, PPbrained
- More Examples
- Used in the Middle of Sentence
- The brain automatically filters out useless information.
- A man's brain whizzes along for years exceeding the speed limit, and something suddenly goes wrong with the steering-gear and it skids and comes a smeller in the ditch. "
- taking the whimseys of a feverish brain for the calm revelation of truth. — Bancroft.
- Used in the Beginning of Sentence
- Brain pathology, as in the case of neuroautoimmune diseases, is worsened, not only by the infiltration of activated lymphoid cells, but also by the release of large amounts of free radicals [21 ].
- Used in the Ending of Sentence
- These iOPCs had the ability to differentiate into oligodendrocytes in vitro and to myelinate host axons after transplantation into the demyelinated shiverer mouse brain.
- It is unclear whether oxidative stress may be acting peripherally or proprioceptively to drive abnormal grooming behavior (e.g. via itch), or whether oxidative stress is acting centrally in the brain.
- Used in the Middle of Sentence
Definition of brain in English Dictionary
- Part-of-Speech Hierarchy
- Nouns
- Countable nouns
- Pluralia tantum
- Countable nouns
- Verbs
- Transitive verbs
- Transitive verbs
- Nouns
- en brains
- en brainless
- en brainy
- en brainstorming
- en brainstorm
Source: Wiktionary
Grammatically, this word "brain" is a noun, more specifically, a countable noun and a pluralia tantum. It's also a verb, more specifically, a transitive verb.