This is the 2994th most frequent Catalan word.
immunitari
"Immunitari" means "immune" or "related to the immune system."
Here, 'immunitari' is used as an adjective modifying 'sistema', denoting the idea of immunity as a function of this system.
El sistema immunitari protegeix el cos contra infeccions.
The immune system protects the body against infections.
In this sentence, 'immunitària' acts as an adjectival form describing 'resistència', indicating the type of resistance related to immunity.
Està investigant com reforçar la resistència immunitària.
He is investigating how to strengthen immunity resistance.
In this example, 'immunitaris' is used substantively, referring directly to entities related to immunity in the plural form.