Passive participle of the verb ܪܵܬ݂ܹܚ (rāṯēḥ, “to boil, come to a boil”).
ܪܬ݂ܝܼܚܵܐ • (rṯīḥā) (feminine ܪܬ݂ܝܼܚܬܵܐ (rṯīḥtā), plural ܪ̈ܬ݂ܝܼܚܹܐ (rṯīḥē))