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irritability the quality or condition of being irritable or easily angered. [2 definitions]
irritable easily annoyed or angered. [2 definitions]
irritant causing or tending to cause irritation, esp. physical irritation; irritating. [2 definitions]
irritate to anger or annoy. [4 definitions]
irritated annoyed or made angry. [2 definitions]
irritating causing irritation; vexing; inflammatory.
irritation the act of irritating, or that which irritates. [3 definitions]
irrupt to burst in suddenly or forcefully. [2 definitions]
IRS abbreviation of Internal Revenue Service, the US government agency responsible for administering and enforcing federal tax laws and collecting federal taxes.
Is. abbreviation of "island" or "islands," or "isle" or "isles" (used in a proper name).
is 3rd person present sing. of be.
Isaac according to the Old Testament, the son of the patriarch Abraham and the father of Jacob and Esau.
Isaac Newton an English philosopher and mathematician who formulated the laws of gravity (b.1642--d.1727).
isagoge an introduction, as to a field of scholarly study or research.
Isaiah a major Hebrew prophet of the eighth century B.C. [2 definitions]
ischemia a localized stoppage of blood supply caused by a blockage in the bloodstream.
ischium the lowest of the three sections of either side of the pelvic bone, on which the body is supported when sitting.
-ise condition, quality, or function.
-ish belonging or pertaining to; of; from. [4 definitions]
Ishmael according to the Old Testament, an illegitimate son of Abraham who was sent into exile with his mother Hagar and who is venerated by Arabs of Islam as their ancestor.
Ishmaelite a member of a tribe considered to be descended from Ishmael and the progenitor of the Arab peoples. [2 definitions]