Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun ir

2 senses of ir

Sense 1
iridium, Ir, atomic number 77 -- (a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium)
       => metallic element, metal -- (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)

Sense 2
Inland Revenue, IR -- (a board of the British government that administers and collects major direct taxes)
       => administrative unit, administrative body -- (a unit with administrative responsibilities)