详细解释:a. 触染性的, 会蔓延的
【医】 (接)触(传)染的
词型变化：
名词:contagiousness副词:contagiously词意辨析：
infectious, contagious这一对词都是形容词，又都具有“传染性的”、“传染病的”意义，但内涵和使用场合有所不同。
infectious: infectious修饰的是“间接传染的病”，指病菌通过空气、食物、水、衣服、容器等物的传染。tuberculosis is an infectious disease.
肺结核是一种传染病。it's said that cancer is not infectious.
据说癌症是不会传染的。
contagious: contagious修饰的是“直接传染的病”，一般指跟病人直接接触而感染的病。scarlet fever is a contagious disease.
猩红热是一种传染病。measles and aids are highly contagious.
麻疹和艾滋病是很易传染的。英语解释：
形容词 contagious:
easily diffused or spread as from one person to another(of disease) capable of being transmitted by infection同义词：catching, communicable, contractable, transmissible, transmittable