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Webster 1913 Edition

leatherneck

leath′er-neckˊ

,

Noun.

1.

(Zool.)

The sordid friar bird of Australia (

Tropidorhynchus sordidus

).

Definition 2024

leatherneck

leatherneck

English

Noun

leatherneck ‎(plural leathernecks)

(slang) A soldier.
(US) Specifically, a marine.
- 2011, Steven Pinker, The Better Angels of Our Nature, Penguin 2012, p. 318:
  The Marine Corps has instituted a martial-arts program in which leathernecks are indoctrinated in a new code of honor, the Ethical Marine Warrior.