Shell Definition, Usage & Real-Life Examples (2 meaning)

Meaning 1：hard outer covering (shell)

shell 🔊

/ʃel/

the hard, protective covering on the outside of things like eggs, nuts, or animals such as turtles.

Shell definition illustrated by a hand holding a large patterned sea shell on a beach.

hard outer covering 🔊

➕

/hɑːrd ˈaʊtər ˈkʌvərɪŋ/

A hard, often brittle, protective outer layer found in nature on various animals, eggs, nuts, and some seeds.

📁 Category：Natural Geography 🔖 Level：Beginner

📘 Details & Usage

📖 Root Explanation

From Old English 'scell,' related to Dutch 'schil' and German 'Schale,' ultimately from a Proto-Germanic root meaning 'to divide, split, peel.'

💡 Mnemonic

Like a snail's HOME or an egg's CASE, a shell is a protective outer SPACE.

📖 Example

The little boy found a beautiful sea shell on the beach and held it up to his ear. 🔊 A young child discovered a lovely seashell on the shore and listened to the ocean sound by holding it to his ear.

🔗 Collocations

sea shell – the hard outer covering of a marine mollusk

egg shell – the fragile outer layer of a bird's or reptile's egg

nut shell – the hard casing that encloses the kernel of a nut

🔄 Synonyms

carapace (n.) – The hard upper shell of a turtle, crustacean, or arachnid.

husk (n.) – The dry outer covering of some fruits or seeds.

exoskeleton (n.) – A rigid external covering for the body in some invertebrate animals.

🌱 Derivatives

shelled (adj.) – Having a shell; having had the shell removed.

shellfish (n.) – An aquatic animal, such as a mollusk or crustacean, that has a shell.

📖 Cultural Story

The word originates from Old English 'scell,' related to the act of separating or peeling. In modern computing, the term 'shell' (e.g., Bash, PowerShell) is used for a command-line interface that wraps around the operating system kernel, metaphorically extending the protective/interface concept.

Meaning 2：artillery projectile (shell)

shell 🔊

/ʃel/

a metal case filled with explosives, fired from a large gun.

Artillery shell meaning shown with a historical projectile on a museum display stand.

artillery projectile 🔊

➕

/ɑːrˈtɪləri ˈprɑːdʒəktaɪl/

A hollow metal case filled with explosives or other harmful agents, designed to be fired from a large-caliber gun or cannon.

📁 Category：Warfare & Battle 🔖 Level：Intermediate

📘 Details & Usage

📖 Example

The maritime museum displayed a rusted artillery shell recovered from a 19th-century warship. 🔊 The naval history museum exhibited an oxidized cannon shell that was retrieved from a battleship from the 1800s.

🔗 Collocations

artillery shell – a large projectile fired by cannons or howitzers

shell casing – the empty metal container that remains after a bullet or shell is fired

🔄 Synonyms

projectile (n.) – An object propelled through the air, especially one fired as a weapon.

cartridge (n.) – A casing containing a bullet and a charge of gunpowder; also used for some artillery rounds.

🌱 Derivatives

shelling (n.) – The act of bombarding a place with artillery shells.