Sharp words in the laboratory (7)

I believe the answer is:

retorts

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'sharp words' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Perhaps there's a link between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for retorts that I've seen before include "Makes witty or angry reply" , "Counters" , "laboratory equipment" , "Sharp replies or rejoinders" .)

I've seen this clue in The Globe and Mail.

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