contagious
adj.
late 14c., from Old French contagieus (Modern French contagieux), from Late Latin contagiosus, from Latin contagio (see contact, n.).
〔蒋〕[tact，tag触， -ious…的] 接触传染的，有传染性的
〔李〕[con-(com-)=with与；tag (tang的变体)=to touch接触；-ious a.=characterized by有……特点的→“characterized by touching with others 特别会与其他人或物接触的”→] a. ①communicable by contact可传染的；有感染力的