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.
n.
also repellant, 1660s, "medicine that reduces tumors," from repellent, adj.. As "substance that repels insects," 1908.
〔蒋〕[pel=push，drive推，逐，驱，-ent形容词后缀，…的] 击退的，击回的，排斥的;[-ent表示物] 防护剂，防水布