ad–

Also from Answers.com... Herpes What is Herpes? Learn the signs and symptoms.

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.]

1. Abbr. for “air-dried.”
2. Abbr. for access door.
3. Abbr. for area drain.
4. Abbr. for “as drawn.”

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.