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immunoglobulin a protein of the immune system that acts as an antibody.
immunology the branch of medicine concerned with antibody production and resistance to disease.
immunosuppressant a drug or other agent that inhibits the normal immune response.
immunosuppression inhibition of the normal immune response by a disease, drug, or other agent.
immunosuppressive of drugs, tending to suppress the natural immune response.
immure to confine within or as though within walls; shut in. [2 definitions]
immutable not subject to change; unchanging or unchangeable.
imp a little demon or evil spirit. [2 definitions]
imp. abbreviation of "import," "imported," or "importer." [2 definitions]
impact a forceful coming together of two objects or bodies. [4 definitions]
impacted forced closely into. [2 definitions]
impair to weaken, damage, or cause to diminish in value or quality.
impala a reddish brown African antelope known for its ability to leap and for the long, ridged, curved horns of the male.
impale to pierce and hold fast with a sharp-pointed instrument such as a spear. [2 definitions]
impalpable not subject to perception by touch; intangible. [2 definitions]
impanel to enroll on a list or panel for jury duty, or to select (a juror or a jury) from such a list.
impart to give all or a part of; bestow or transmit. [2 definitions]
impartial not partial or prejudiced; even-handed or objective.
impassable impossible to go past, through, over, or around.
impasse a situation that allows no escape or solution; stalemate. [2 definitions]
impassible not subject to feeling injury or pain. [2 definitions]