testaceous

9.9

Having a hard shell or outer covering like a turtle

adjective
/tɛˈsteɪʃəs/

Specialized

: testáceo

Turtles are testaceous creatures, protected by their distinctive shells.

Examples

The testaceous structure of the turtle protects it from predators.
Look at the testaceous shell I found on the beach!
Some mollusks possess a testaceous structure that separates them from other soft-bodied animals.
The biologist described several testaceous seeds she found in the tropical rainforest.
Some mollusks possess a testaceous structure that separates them from other soft-bodied animals.
Turtles are testaceous creatures, protected by their distinctive shells.
The biologist described several testaceous seeds she found in the tropical rainforest.

Synonyms

hard-shelled

vstestaceous

1 3.6

Having a hard outer covering that protects what is inside, like a crab or nut

is the general term for any hard outer covering often for seeds and animals

shelled

vstestaceous

1 1.9

Having a hard outer covering like a crab or nut

is narrower stressing that the covering is hard rather than any shell

crustaceous

vstestaceous

Specialized

8.6

Having a hard outer shell like a crab or lobster

is broader applying to any hard shell not only crustacean-like ones

Surface Forms

testaceous positive

Morphology

testaceous = testa (opaque) = testa + ceous

Although built from Latin testa ('shell') plus an adjectival suffix, the root 'testa' and the suffix are technical/rare in general English, so learners cannot readily derive the meaning.

Etymology

Testaceous comes from the Latin testa, which means 'shell' or 'piece of broken pot', and was used for hard outer things like a turtle's shell. So, to call an animal or seed testaceous is to say it has a hard shell or outer coat for protection.