Learn how to say Repellency correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word repellent:
1 [often in combination] able to repel a particular thing; impervious to a particular substance:
2causing disgust or distaste:
the idea was slightly repellent to her
1a substance that dissuades particular insects or other pests from approaching or settling:
a flea repellent
2a substance used to treat something, especially fabric or stone, so as to make it impervious to water:
treat brick with a silicone water repellent
mid 17th century: from Latin repellent- ‘driving back’, from the verb repellere (see repel)
Repellent can also be spelled repellant; both spellings are acceptable, although repellent is far more common.