- hydrocodimer
- hydrocotarnine
- hydrodealkylation
- hydrofining
- hydrofluoride
- hydrogasification
- hydrogen blistering
- hypidiomorphic texture
- hypogene
- hypotonic
- ice drift
- ice factory
- ice jam
- ice needle
- ideal section
- identification device
- idioblast
- idiomorphic crystal
- idle
- idle period
- idle time
- idleness
- idler
- idlershaft
- idling speed
- hypermultiplet
- hypoeutectic
- hypogene process
- hypophosphorous
- hypothermal vein
- hysteresis
- ice avalanche
- ice motion
- imbedding
- imbibe
- imbibition
- imbricated structure
- imbuia
- imidogen
- immersion heater
- immersion oil
- impact elasticity
- impact head
- impact screen
- impair
- impenetrable
- imperforate
- imperial bushel
- imperial gallon
- imperial pint
- impermeable barrier
- impervious rock
- impingement baffle
- imporous
- Import duty
- impoverished
- impregnant
- impregnated ore
- impregnating compound
- impregnation vein
- idosaccharic
- igneous foliation
- igneous intrusion
- ignitability
- ignition advance
- ignition cable
- ignition control
- ignition harness
- ignition key
- ignition losses
- ignition magneto
- ignition quality
- illumination
- illuviation
- illuvium
- imbedded
- imbrication
- imido group
- imitation leather
- immature
- immature crystal
- immature soil
- immersion plating
- impact drill
- impact loading
- impact mill
- impact strength
- impact test
- impeller
- imperfect cleavage
- impermeable rock
- impingement
- impingement area
- implied basement
- import
- impregnate
- impregnated sand
- impression
- impression roller
- improvement