I-spin

Ice cream

Ice field

Ice manufacture

Ice point

Ice-templated ceramics

Iceberg

Icebreaker

IceCube Neutrino Observatory

Ichnology

Ichthyopterygia

Ichthyornithiformes

Ichthyostega

Igneous rock

Ignimbrite

Ignition system

Illiciales

Illite

Illuminance

Illumination

Image tube (astronomy)

Imaging mechanical defects

Imaging of developmental biological processes

Immittance

Immune checkpoint blockade

Immune complex disease

Immune regulation by the microbiome

Immune response in inflammatory bowel disease

Immunity

Immunoassay

Immunochemistry

Immunoelectrophoresis

Immunofluorescence

Immunogenetics

Immunoglobulin

Immunoglobulin genes

Immunologic cytotoxicity

Immunological deficiency

Immunological ontogeny

Immunological phylogeny

Immunology

Immunonephelometry

Immunopathology

Immunosuppression

Immunotherapy

Impact

Impedance matching

Impedance units from the quantum Hall effect

Impsonite

Impulse (mechanics)

Impulse generator

Impulse turbine

In vivo 3D optical microendoscopy

In-stream tidal power generation

Inadunata

Inarticulata

Incandescence

Incandescent lamp

Incentive-sensitization disease model of addiction

Inclined plane

Incompressible flow

Incorporating exposure science into life-cycle assessment

Independent system operator

Index fossil

Indian Ocean

Indium

Indohyus: the origin of whales

Indole

Indoor air pollution

Indoor fungi

Indoor navigation for first responders

Induced pluripotent stem cell

Inductance

Inductance measurement

Induction coil

Induction heating

Induction motor

Inductive coordination

Inductive voltage divider

Inductor

Industrial ecology

Industrial engineering

Industrial health and safety

Industrial meteorology

Industrial microbiology

Industrial trucks

Industrial wastewater treatment

Inertia

Inertia welding

Inertial confinement fusion

Inertial navigation system

Infant Australopithecus from Dikika

Infant diarrhea

Infant respiratory distress syndrome

Infarction

Infection

Infectious disease

Infectious disease control in animal shelters

Infectious disease in food animals

Infectious mononucleosis