- impure
- impurity density
- impurity type
- improver
- impulse recorder
- impurities
- impurity concentration
- impurity element
- in mesh
- inaccuracy
- inactive
- inactive allele
- inactivity
- inbuilt
- inclined distance
- inclined seam
- inclined stratum
- inclusion
- inclusion complex
- incoercible
- incoherent twin
- incoming panel
- incomplete combustion
- incorporate
- incremental permeability
- incrust
- indelible
- index
- index book
- Indian red
- indicated efficiency
- indigo
- indirect oxidation
- induced draft
- induction balance
- induction log
- induction system
- industrial benzene
- inactivation
- inactive black
- incandescence
- incipient peneplain
- incipient pitting
- inclination
- incomings
- incorporated company
- incorporeal
- incremental dilution
- indelible ink
- Index number
- india ink
- indicating scale
- indication meter
- indicator cylinder
- indirect observation
- indirect steam
- individual drive
- induced radioactivity
- induction sonde
- industrial resins
- industrial-strength
- inface
- infinite reflux
- infralittoral
- infusibility
- infusible
- infusorial earth
- Inconel
- inconstancy
- incrustation
- incubator
- index map
- index mineral
- Indian yellow
- indicated power
- indicator
- indicator card
- indigo copper
- indirect contact
- indissolubility
- indraught
- induced draught
- induced reaction
- induction
- induction effect
- induction manifold
- induction period
- induction valve
- industrial chemistry
- industrial diamond
- inedible fat
- inert atmosphere
- inerting
- inflammable solvent
- inflow
- infragranitic
- infrastructure
- infusion
- ingot iron
- ingot metal