A lower case a with a line over it means before in medical terminology. For instance, ac means before meals
Lower case a with a line over it stands for "ante," and means "before" in medical terms.
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The medical abbreviation "s with a line over it" is commonly used to denote "without" in medical terminology. It is derived from the Latin word "sine," which means "without." This abbreviation is often used in prescriptions or medical charts to indicate that a certain medication or treatment should be administered without a specific ingredient or component.
The letter c with a line over it means, "with"; at least in medical terminology.
with
It means "with".
It's from the latin, "cum" (pronounced coom). Most medical terminology is derived from the classical languages (Greek and Latin).
x with a line above it as I've seen/used it in Nursing means "except".
So if you saw something like :
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"all antibiotics x Penicillin"
it would mean "all antibiotics except Penicillin"
Usually a little q by itself means every or each, and is not written with a line over it. But a little c with a line over it means with, or a little s with a line over it means without.