repellent (adj.)

also repellant, 1640s, from Latin repellentem (nominative repelens), present participle of repellere (see repel). Originally of medicines (that reduced tumors); meaning "distasteful, disagreeable" first recorded 1797.

repellent (n.)

also repellant, 1660s, "medicine that reduces tumors," from repellent (adj.). As "substance that repels insects," 1908.

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