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4000 Essential English Words 5 Unit 23: How Comet Got His Tail

4000 Essential English Words 5 Unit 23: How Comet Got His Tail

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Word List

  • astronomical [ˌæstrəˈnɒmikəl] adj. 

If something is astronomical, then it is extremely large.

 It’s an astronomical distance between the Milky Way galaxy and the nearest galaxy.

  • atom [ˈætəm] n. 

An atom is the smallest unit of a substance.

 A molecule consists of a combination of two or more atoms.

  • breadth [bretθ] n. 

Breadth is the distance from one side to the other side of something.

 The breadth of the northern wall of the house is twenty meters.

  • circumference [səˈkʌmfərəns] n. 

circumference is the distance completely around a circular object.

 The circumference of the Earth is obviously much larger than a baseball’s.

  • comet [ˈkɒmit] n. 

comet is an object in space made of ice and rock with a tail of glowing dust.

 Comets take many decades to complete an orbit around a star.

  • crater [ˈkreitər] n. 

crater is a large hole in a planet’s or moon’s surface.

 They could clearly see the big crater on the moon through the telescope.

  • crescent [ˈkresənt] n. 

crescent is the curved shape lit on the moon’s face during its early and late stages.

 Ten days ago the entire moon was bright, but now only a small crescent is shining.

  • debris [ˈdəbriː] n. 

Debris is the small pieces scattered from something wrecked or destroyed.

 The debris from the cube scattered on the floor.

  • despair [disˈpɛər] n. 

Despair is the complete loss of hope.

 After the other company won the account, our salespeople were filled with despair.

  • embed [imˈbed] v. 

To embed something means to place it firmly within a surrounding thing.

 The logger embedded the ax into the wood after chopping several logs.

  • fragment [ˈfrægmənt] n. 

fragment is a small part of something.

 After the light broke, there were fragments of glass to clean up.

  • galaxy [ˈgæləksi] n. 

galaxy is any extremely large collection of star systems.

 Our solar system is located in the outer area of our galaxy.

  • gigantic [dʒaiˈgæntik] adj. 

If something is gigantic, then it is extremely large.

 Some dinosaurs were so gigantic that they were the size of buildings.

  • gloom [gluːm] n. 

Gloom is a state of being almost completely dark.

 In the gloom of the morning, it was difficult to see the boat on the lake.

  • radiate [ˈreidieit] v. 

To radiate means to send out energy or heat.

 The heat from the fireplace radiated throughout the room.

  • roam [roum] v. 

To roam means to move around without a plan or purpose.

 All day the cows roamed around the field eating grass.

  • solitary [ˈsɒliteri] adj. 

If something is solitary, then it is lonely or the only one.

 The only thing in the room was a solitary chair.

  • spectrum [ˈspektrəm] n. 

The spectrum is the full range of color ranging from red to violet.

 You can see the entire spectrum in a rainbow.

  • sphere [sfiə:r] n. 

sphere is a three-dimensional round shape, like a ball.

 The balloons were inflated into a variety of colorful spheres.

  • status [ˈsteitəs] n. 

Status is the position of something or someone in relation to others.

 She had achieved the status of being the smartest girl in the class.

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