Definition

Referring to a molecule or object that can be placed on top of its mirror image without any changes, meaning it does not have a distinct left or right form.

Example

The molecule is achiral, meaning it can be superimposed on its mirror image.

Conversation

Did you know that some molecules are achiral?

Really? I thought everything had to be chiral to be interesting.

Nope! An achiral molecule is actually superimposable on its mirror image.

That's cool! I guess that makes them simpler in some ways.

Synonyms & Antonyms

Root Explanation

Achiral → It is formed from "a-" (meaning not) and "chiral" (from Greek "cheir", meaning hand). The term describes objects that are not distinguishable from their mirror images, unlike chiral objects which are. Thus, achiral refers to something that does not have handedness.

Memory Tip

Think of 'not' ('a-') and 'hand' ('cheir') to remember that 'achiral' means something that does not have a distinct left or right, or handedness.

Visually Confused Words