What is the meaning of Ir-?

Used for expressing negation; not

Form used before a root beginning with the letter r of in-

not; negation

Alternative form of in-

Alternative form of in-

Alternative form of il-

not; negation, equivalent to ir- in English

equivalent to ir- in English

Alternative form of in-, used before r.

Alternative form of in-, used before r.

Source: wiktionary.org