Scientific name: mandragora officinarum
Mandrake is a poisonous plant. It has a thick root that is often shaped like a human, hence the name mandrake. There are many legends around the mandrake plant, including the myth that when you pull it up, the plant screams and kills everyone who hears the scream. Mandrake has a hallucinogenic effect and has been used in rituals and magic ceremonies for centuries.
Something is opaque if you can't see through it. Most things are opaque. The term is most often used to describe stockings that are not transparent.
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Ris forRattlesnake
Scientific name: subfamily: crotalinae
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You shake something when you move it vigorously up and down or from side to side. The dog in the photo is shaking water out of its coat. People shake drinks like milk to make them frothy.
Shaking can be used to communciate too. People shake their heads from side to side to mean "no", and two people will shake hands as a greeting.