crustaceans - Master This Word
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crustaceans Word Meanings
- a type of sea creature with a hard shell, like crabs and lobsters
- an aquatic animal with a segmented body and jointed limbs
crustaceans Example Sentences
Example sentences are the start of understanding. Don't rush to memorize. First feel how the word works in a sentence.
crustaceans Phonetic & Pronunciation
UK
/krʌsˈteɪ.ʃən/
US
/krʌsˈteɪ.ʃən/
crustaceans Word Etymology
The word 'crustacean' comes from the Latin 'crustaceus' meaning 'having a shell', derived from 'crusta' meaning 'shell'. The historical journey follows Latin to Old French and then to English. Imagine a crab in its hardened shell, a miniature fortress, representing its protection and resilience.
Note 1: These definitions and etymologies are not standard dictionary definitions, but extended explanations provided to help with memorization and understanding of the actual application of words. Through this background information, we strive to make words more vivid and easier to understand, and help you remember their meanings in real life.
Note 2: LexiTalk designs the learning flow around the linguistics principle of “Comprehensible Input.” When learners encounter material that is slightly above their level but still understandable from context, the brain naturally absorbs the language. That’s why we keep every word inside authentic contexts, using examples and associations to help you understand it and use it flexibly.
Read the FAQ explanation of Comprehensible InputReal Context
Crustacean is a term used in biology to describe a large group of aquatic animals that have a hard external shell. Members include crabs, lobsters, shrimp, crayfish, and barnacles. They typically have a segmented body with jointed limbs and a ventral abdomen that can be tucked under the shell. Most crustaceans live in water, from oceans to freshwater, and many molt as they grow to shed their old shells. The word emphasizes the protective exoskeleton rather than internal bones. Etymology traces crustaceus from Latin meaning having a shell; from Latin to Old French and into English, reflecting how early observers imagined these fortress-like bodies.
Usage Reminders
- - Crustacean is a countable noun when talking about a group; use crustaceans for plural.
- - Not all crustaceans are large; many are tiny like krill.
- - Distinguish crustaceans from mollusks and insects.
- - Remember they molt to grow, shedding their shell.
- - Use with specific names (crabs, lobsters, shrimp) or the general term.
Common Misconceptions
- Not all crustaceans are large; many are tiny like krill.
- Crustaceans are not insects; they are a separate group.
- They molt to grow, but not all individuals molt at the same life stage.
- They are primarily aquatic; some live on land or semi-terrestrially.
- They have external shells, but not every species keeps a shell at all times.
Thinking Differences
Think of crustaceans as a biological group defined by an external shell and jointed limbs. Learners often assume all crustaceans are large or that all have shells at all times; English labels also encourage listing specific species.
Learning Tips
- 1) Memorize the key examples: crab, lobster, shrimp, barnacle.
- 2) Note the hatched shell change (molt) as they grow.
- 3) Distinguish from mollusks and insects.
- 4) Practice pronunciation: crustacean.
- 5) Use crustacean in science or nature contexts.
- 6) Compare with other animal groups to reinforce taxonomy.
Related Listening
🌱 Lite (Beginner)
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