Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLES FROM THE WEB FOR REPELLENTS

If so, how effective are these repellents in protecting the individual or the species?

Repellents of various kinds are used, for warding off the attacks of the insects.

The repellents used are either smudges, or surface applications made to keep the flies from biting.

The efficacy of repellents against these flies is probably, however, not very great.