Caustic – 1. Able to burn skin by chemical reaction. 2. Hurtful, as in a remark intended to be critical or unkind

(Pronounced kaw-stik)

To remember the definition of the word caustic, use the following mnemonic:

At the core of the stick (caustic) was fluid that could burn your skin and hurt.

Examples of caustic in a sentence (Able to burn skin by chemical reaction)

The sap from the tree was caustic so urgent medical attention was required.

Gloves had to be worn during the experiment as many of the materials were caustic.

The caustic liquid had contaminated the water so washing your hands was lethal. 

Examples of caustic in a sentence (A very hurtful remark)

Caustic comments were made towards the singer at the talent competition, she didn't make it through to the next round.

He opened his mouth to make a caustic remark.

Some pretty caustic comments had been made on the presidents handling of the war.