Atrial fibrillation (A-tre-al fi-bri-LA-shun), or AF, is the most common type of arrhythmia (ah-RITH-me-ah). An arrhythmia is a problem with the rate or rhythm of the heartbeat. During an arrhythmia, the heart can beat too fast, too slow, or with an irregular rhythm.
Detailed Synonyms for also known as in English. also known as: also known as adv. also known as so called; alias; known as; named; what they call; going by the name of; also known as; called so called adj. alias adv. known as adj. named adj. what they call adj.
A synonym is a word with the same meaning (or nearly the same) as  another word. For example, a synonym for boat is  ship. Not all synonyms can be used in all contexts, beca â¦ use  words have specific connotations.   Synonyms are words that mean the same, or about the same, as  another word.   Words having the same meaning as each other are synonyms.   Not all synonyms can replace each other for every given context.   Most words have specific as well as general meanings.   For instance, a synonym for lazy is slothful.