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Why’s adimō’s prefix ad-, not ab-?

All pages refer to *Oxford Latin Dictionary* 2012 2nd edition (OLD). Page 48 breaks down *adimō* as ‘[AD- + EMŌ]”, and defines *adimō* as follow

>1 To remove (something) by physical force (from a person), take away; (spec.) to remove (a part of the body), e.g. by castration. 

#### Why isn’t the prefix *ab-*, when [*ab-* means from](https://old.reddit.com/r/latin/comments/wcmxgu/differences_between_ex_and_ab/iieegwp)? [“The prefix **ab-** is used here to mark absence or deprivation.”](https://latin.stackexchange.com/a/14409)

#### Why’s the prefix *ad-*, when *ad-* DOESN'T mean ‘from’?  Page 39 defined *ad-* as follows

>ad- is usually combined with vbs. or vbl. derivatives
and adds one or more of the senses of the preposition,
e.g. motion to or against (*adeo, aggredior*) or to oneself
(*accipio*), direction towards (*advert*), placing on
or against (*acclino, alligo*), reaching (*aduenio, att ingo*),
nearness or presence (*adsum, alluo*), attention, response,
etc. (*admiror, adnuo*), adjustment (*adapto, assuesco*),
inception (*adedo, aduro*), intensification (*adamo*, also the
advs. *apprime, affabre*).