Superimposable on its mirror image; amphichiral(adjective)
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Use "achiral" in a sentence
"Oh, and bonus points if you know what happens if a catalyst makes the transition states achiral"
"The successful candidate will develop chiral and achiral"
"But I do like it when my biology colleagues have the broad outlines - that molecules with chiral centers, other things being equal, are often harder to make than achiral structures, that sticking a lot of cycloalkyl grease on a molecule is asking for metabolic trouble (no matter what it does for the potency in the assays), what sorts of things tend to make a molecule more (or less) soluble, and so on."