Injury – la herida
(Pronounced eh-ree-dah (the "H" is silent))
To remember that injury is pronounced eh-ree-dah (herida) in Spanish, use the following mnemonic:
A serious injury resulted when a reader (herida) at the library removed a large book from the shelf.

Herida is feminine, so it's la herida. Imagine a lady causing injury.

Examples of herida (injury) in a sentence
La herida en su brazo necesita puntos.
(His arm injury needs stitches.)
Ella limpió la herida con agua y jabón.
(She cleaned the injury with water and soap.)
La herida tardará dos semanas en sanar.
(The injury will take two weeks to heal.)