ir (Noun) — A board of the British government that administers and collects major direct taxes.
ir (Noun) — A heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium.
ir (Prefix) — Not (il- is used before an l, im- before a b, m or p, ir- before an r).
ir (Prefix) — In, into, towards, within (il- is used before an l, im- before a b, m or p, ir- before an r).