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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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Definitions of repellent from WordNet
1
repellent (n.)
a compound with which fabrics are treated to repel water;
Synonyms: repellant
repellent (n.)
a chemical substance that repels animals;
Synonyms: repellant
repellent (n.)
the power to repel;
she knew many repellents to his advances
Synonyms: repellant
2
repellent (adj.)
serving or tending to repel;
I find his obsequiousness repellent
Synonyms: rebarbative / repellant
repellent (adj.)
highly offensive; arousing aversion or disgust;
the idea of eating meat is repellent to me
Synonyms: disgusting / disgustful / distasteful / foul / loathly / loathsome / repellant / repelling / revolting / skanky / wicked / yucky
repellent (adj.)
incapable of absorbing or mixing with;
a water-repellent fabric
Synonyms: resistant
From wordnet.princeton.edu