Immunoreactive secretin
immunoreactive somatostatin
immunoreactivities
immunoreactivity score
Implementing Rules
incidence rates
incident reporting scheme
Independant Rear Suspension
Independent Research Service
Independent Review Service
Indian Readership Survey
Indian Reconnaissance Satellite
Indian Register of Shipping
Indian Registration System
Indian Registry System
Indian Remote Satellite
indoor residual house-spraying
Industrial Robot System
infared suppressor
Infinitely Rigid System
inflammatory response system
Information Receiving Station
Information Requirements
Infra Red Signature
Infrared Reflectance Spectroscopy
Infrared Signature
infrared spectra
inhibitory receptor superfamily
Initial Receive Sequence Number
Inland Revenue Service
inner root sheath
Inquiry and Reporting Service
Inquiry and Reporting System
Installation Readiness System
Instantaneous response spectra
Institut für ganzheitliche Rehabilitation und Spor
Institute of Regional Studies
institutional representatives
Instructor Rating System
In-Structure Response Spectrum