casque

noun

ˈkask 

1

: a piece of armor for the head : helmet

2

: an anatomical structure (such as the horny outgrowth on the head of a cassowary) suggestive of a helmet

Examples of casque in a Sentence

Recent Examples on the Web

This structure was composed of solid bone, unlike the highly porous, pneumatic casques found on some modern birds. — Jacek Krywko, ArsTechnica, 7 Mar. 2026

The ornamentation found on the beaks and tops of heads of hornbills are a structure similar to the casque on the cassowary, a bird species found in New Guinea and Australia. — Dinah Voyles Pulver, USA Today, 13 Nov. 2025

The iguanas are known for their distinctive casque (helmet-like crest) and long, thin limbs. — Angel Saunders, PEOPLE, 10 Sep. 2025

These flightless birds are striking in appearance – bright blue skin, a helmet-like casque on their heads, and dagger-like claws on each foot. — Scott Travers, Forbes.com, 8 June 2025

Elsewhere among the amphibious hoppers, mother casque headed frogs, of the Hemiphractus genus, adhere their eggs directly onto the skin. — Liz Langley, National Geographic, 11 Mar. 2017

Word History

Etymology

Middle French — more at cask

First Known Use

1580, in the meaning defined at sense 1

Rhymes for casque

• ask
• bask
• basque
• cask
• flask
• mask
• masque
• pasch
• task
• subtask
• unmask

Kids Definition

casque

noun

ˈkask 

: helmet sense 1