ad

add [Lat. adde]; let there be added [up to a specified amount, Lat. addatur]; axiodistal; right ear [Lat. auris dextra]

* * *

AD abbr

1) Alzheimer's disease

2) average deviation

* * *

[L. ad to] used in writing prescriptions to indicate that a substance (usually a diluent) be added up to a certain amount.