- isobutylene
- isocyanate
- isodose curves
- isolated
- isolated patient lead
- isolated pitting
- isolated temperature
- isolating part
- isomer
- isooctane
- isopentene
- isoprene
- isoteniscope
- isotherm
- isothermal atmosphere
- isothermal line
- isothermal map
- isothermal mass transfer
- ITA = International Tunneling Association
- J
- J = joule
- j-bolt
- jack
- jack algorithm
- jack hammer
- jack lamp
- jack outrigger
- jack pad
- jack plate
- jack rafter
- jack screw
- jack up
- jacket
- jackknife
- jackknife door
- jackknifing
- Jaclb`s ladder
- jamb
- Japan
- Japan Architects' Association
- Japan Society of Civil Engineering
- Japanese Building Law Test Method
- japanning room
- JASMINE
- jaw
- JCNFSO = Joint Council of National Fire Service Organization
- jellied gasoline
- jelly bomb
- jet
- jet - core region