Upper-Intermediate (B2)
IPA: /tʃəˈloʊniən/
KK: /ˈtʃɛloʊniən/
Definition
Relating to a group of reptiles that includes turtles and tortoises.
Example
The chelonian species are known for their hard shells and slow movement.
Conversation

Did you know that the chelonian species are among the oldest living creatures on Earth?

Really? I had no idea they were that ancient!

Yeah, it's fascinating how they have survived for so long with their unique adaptations.

Definitely! I think their chelonian traits help them thrive in various environments.
Synonyms & Antonyms
Antonyms
mammalian
avian
terrestrial
Definition
A type of reptile that includes turtles and tortoises, belonging to the order Chelonia.
Example
The chelonian slowly made its way across the sandy beach.
Conversation

Did you know that a turtle is considered a type of chelonian?

Really? I had no idea it was part of that group.

Yeah, there are so many fascinating facts about chelonian creatures.
Root Explanation
Chelonian → It is derived from "chelonia" (from Greek "chelōnē", meaning tortoise or turtle). The term refers specifically to the group of reptiles that includes turtles and tortoises.
Memory Tip
Think of the Greek word for tortoise ('chelōnē') to remember that 'chelonian' refers to turtles and tortoises.
Visually Confused Words
helonin
heliconian
acheronian
helonias
cholonan
cetonian