Rhodiola rosea (commonly golden root, rose root, roseroot, Aaron's rod, Arctic root, king's crown, lignum rhodium, orpin rose) is a perennial flowering plant in the family Crassulaceae. It grows naturally in wild Arctic regions of Europe (including Britain), Asia, and North America, and can be propagated as a groundcover. Rhodiola rosea has been used in traditional medicine for several disorders, notably including treatment of anxiety and depression. As of 2019, there is no high-quality clinical research to indicate it is effective for treating any disorder, and the United States Food and Drug...

A mumpsimus () is a "traditional custom obstinately adhered to however unreasonable it may be", or "someone who obstinately clings to an error, bad habit or prejudice, even after the foible has been exposed and the person humiliated; also, any error, bad habit, or prejudice clung to in this fashion". Thus it may describe behaviour or the person who behaves thus. For example, all intensive purposes is a common eggcorn of the fixed expression all intents and purposes; if a person continues to say the eggcorn even after being made aware of the correct form, either the speaker or the phrase may be...