This is the 415th most frequent Persian word.
کرونایی
Related to the coronavirus or COVID-19.
Here, 'کرونایی' is used as an adjective to describe 'ماسک' (mask) as related to Corona.
ماسک کرونایی ضروری است.
The Corona-related mask is necessary.
In this sentence, 'کرونایی' qualifies 'اطلاعات' (information) as related to Corona.
اطلاعات کرونایی را باید مطالعه کنید.
You should study Corona-related information.
Here, 'کرونایی' specifies 'دارو' (medicine) to mean relating to Corona.