alter

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alter

(ôl′tər)
v. al·tered, al·tering, al·ters
v.tr.
To castrate or spay (an animal, such as a cat or a dog).
v.intr.
To change or become different.

al′ter·a·bil′i·ty, al′ter·a·ble·ness n.
al′ter·a·ble adj.
al′ter·a·bly adv.

alter

verb
(1) To castrate (obsolete). 
(2) To change in any manner.

Alter

An alternate or secondary personality in a patient with DID.

alter

euphemism for castration of a male animal; sometimes used as a synonym for spay of a female. Called also cut, geld.
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2,4-Dichlorophenoxyacetic acid in developing rats alters behaviour, myelination and regions brain gangliosides pattern.
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While other researchers have studied the anatomic and physiologic abnormalities that interfere with reproduction in exposed animals, Markowski and colleagues suggest that TCDD in the fetal brain also alters sexual motivation as well as copulatory behavior itself.