Metaphor originated from the Greek word, metaphor which simply means to transfer. Analogy on the other hand came from the Greek word, analogia which means proportion. Given these etymologies, metaphor is a figure of speech that actually transfers the meaning of one thing directly on another unit.
Medicines that are taken âas neededâ are known as âPRNâ medicines. âPRNâ is a Latin term that stands for âpro re nata,â which means âas the thing is needed.â. Itâs important to know the difference between daily and âas neededâ medicines.hese instructions should include the following information: 1  How much medicine you can take in a set period of time. 2  When to take your PRN medication. 3  When to take scheduled and PRN medications for a single health problem.
The term PRN is a shortened form of the Latin phrase pro re nata, which translates roughly as as the thing is needed.PRN, therefore, means a medication that should be taken only as needed. Pain medicines, sleeping pills, and cough medicines are common examples of PRN medicines.ost blood pressure medications are taken as a preventive method or for controlling the rise of blood pressure. In light of this, a pro re nata (PRN) order from your doctor or â¦ cardiologist is unlikely. However, if the medication is for controlling acute systems of blood pressure, it is usually used pro re nata.