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Ad-

 - 4 dictionary results

ad-

 
a prefix occurring in loanwords from Latin, where it meant “toward” and indicated direction, tendency, or addition: adjoin. Usually assimilated to the following consonant; see a-5, ac-, af-, ag-, al-, an- 2, ap-1, ar-, as-, at-.
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Origin:
< L ad, ad- (prep. and prefix) to, toward, at, about; c. at 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2010.
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ad-  
pref.  

  1. ac- or af- or ag- or al- or ap- or as- or at- Toward; to. Before c, f, g, k, l, p, q, s, and t, ad- is usually assimilated to ac-, af-, ag-, ac-, al-, ap-, ac-, as-, and at-, respectively.

  2. Near; at: adrenal.


[Latin, from ad, to; see ad- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

ad- 
prefix expressing direction toward or in addition to, from L. ad "to toward," from PIE *ad- "to, near, at" (cognate with O.E. æt "at"). Simplified to a- before sc-, sp- and st-; modified to ac- before many consonants and then re-spelled af-, ag-, al- etc., in conformity with the following consonant (e.g. affection, aggression). In O.Fr., reduced to a- in all cases, but written forms were refashioned after L. in 14c. in Fr., and 15c. in Eng. words picked up from O.Fr. In many cases pronunciation followed the shift.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

ad- pref.

  1. or ac- or af- or ag- or al- or ap- or as- or at- Toward; to. Before c, f, g, k, l, p, q, s, and t, ad- is usually assimilated to ac-, af-, ag-, ac-, al-, ap-, ac-, as-, and at-, respectively: adductor, acclimation, agglutinant.

  2. Near; at: adrenal.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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