an infectious disease can be passed easily from one person to another, especially through air or water 传染性的，感染的（尤指通过呼吸） Oxford Collocations Dictionaryverbs- be
- highly
- very
- potentially
- …
- [not usually before noun]
if a person or an animal is infectious, they have a disease that can be spread to others 患有传染病；有传染力 Oxford Collocations Dictionaryverbs- be
- highly
- very
- potentially
- …
compare contagious
Word Originmid 16th cent.: from infection + -ous.