© 2026 Sloth Lingo. Learn easy. Lounge wisely.

radiolarian

Upper-Intermediate (B2)

IPA: /ˌreɪdiəˈlɛəriən/

KK: /ˌreɪdiəˈlɛəriən/

noun
Definition

A type of tiny marine organism that has a hard, glass-like skeleton and is often found floating in the ocean. They are known for their intricate shapes and are part of the plankton community.


Example

Radiolarians are important in ocean ecosystems as they contribute to the marine food web.


Conversation
Sloth A
Have you ever heard of a radiolarian?
Sloth B
No, what’s that?
Sloth A
It's a tiny marine creature with a siliceous skeleton, really interesting!
Sloth B
That sounds fascinating! I love learning about ocean life.

Synonyms & Antonyms
Synonyms
protozoan
plankton
organism
Antonyms
predator
carnivore
herbivore
Root Explanation

Radiolarian → It is formed from "radius" (from Latin *radius*, meaning ray or beam) and "-laria" (from Latin *laria*, meaning pertaining to). The word refers to a group of single-celled organisms characterized by their radiating, ray-like structures.

Memory Tip

Think of 'rays' ('radius') that these tiny organisms have, which helps you remember that 'radiolarian' refers to those with ray-like features.

Visually Confused Words
brachiolarian
Is this page helpful?