noun. Assimilated form (in Latin, etc.) of in- before r. In the following words, in the etymology, the prefix ir- is usually referred directly to the original in- or in.

An abbreviation of Ireland.

noun. Assimilated form (in Latin, etc.) of in- before r. In the following words, in the etymology, the prefix ir- is usually referred directly to the original in-.

noun. An abbreviation of Irish.

noun. In chem., the symbol for iridium.

noun. a board of the British government that administers and collects major direct taxes

noun. a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium