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Glossary results for "D"

dairy

a term used to describe products that come from milk, such as cheese, yogurt, and butter

daisy

a small, white flower with a yellow centre

dandelion

a flowering plant that is known for its yellow flowers and fluffy seeds

Daniel Gabriel Fehrenheit

a German physicist and instrument maker who is best known for inventing the Fahrenheit temperature scale

darmstadtium

a chemical element with the symbol Ds and atomic number 110

data

facts and statistics collected together for reference or analysis

David Attenborough

a British broadcaster, natural historian, and author, best known for his work on nature documentaries

deafness

a hearing impairment that makes it difficult or impossible to hear

debris

scattered fragments of something that has been destroyed or broken up

December

the twelfth and final month of the year in the Gregorian calendar and in the Julian calendar

decibel

a unit of measurement used to quantify the loudness of a sound

decibel metre

a device that measures the loudness of sound

deciduous

an adjective that describes plants that lose their leaves seasonally

decompose

the process of breaking down organic matter into simpler substances

deficiency

a lack of something that is needed

deforestation

the clearing of forests for human use

degrees Celsius

a unit of measurement for temperature

density

the mass of a substance per unit volume

deposit

a substance that is left behind by a chemical reaction

depressant

a drug that slows down the central nervous system

desert

a region that receives very little rainfall

diagnose

the identification of a disease or condition by examination of a patient's signs and symptoms or a machine's issue

diagram

a drawing that shows the parts of something and how they are connected

diameter

the distance across a circle, passing through the centre

Dian Fossey

an American primatologist and conservationist who was known for her work studying gorillas in Rwanda

diaphragm

a muscular partition that separates the chest from the abdomen

diet

the food and drink that a person or animal regularly eats

diffuse

to spread out over a large area

digest

to break down food into smaller molecules that can be absorbed by the body

digestive system

a group of organs that work together to break down food into smaller molecules that can be absorbed by the body

dilute

to make something less concentrated by adding more of something else

dimmer switch

a device that controls the brightness of a light bulb

direction

the course or way in which something moves, goes, or points

discharge

the release of something, such as electricity, fluid, or waste

disperse

to spread out or scatter

dissolve

to break down into smaller pieces and mix evenly with another substance

Dmitri Mendeleev

a Russian chemist and inventor who is best known for creating the periodic table of elements

documentary

a film or TV program that tells a true story

dog

members of the Canidae family, which also includes wolves, foxes, and jackals

domain

a taxonomic category that is used to classify living things

Dorothy Hodgkin

a British biochemist who was awarded the Nobel Prize in Chemistry in 1964 for her work on the structure of penicillin and vitamin B12

drain

a pipe or channel that carries away water or other liquids

drill

a tool that is used to make holes in materials

drought

a prolonged period of abnormally dry weather

drug

a substance that can have a physiological effect when ingested or otherwise introduced into the body

dubnium

a chemical element with the symbol Db and atomic number 105

dull

not bright or interesting

durable

lasting a long time without breaking or becoming damaged

dwarf planet

a celestial body that is in orbit around the Sun

dysprosium

a chemical element with the symbol Dy and atomic number 66