ra·di·o·im·mu·no·as·say 
(rā′dē-ō-ĭm′yə-nō-ăsā, -ĭm-y′-)
(rā′dē-ō-ĭm′yə-nō-ăsā, -ĭm-y′-)n. Abbr. RIA
A technique used to quantitate minute amounts of a substance, such as a hormone, in blood or another liquid. It involves the use of radioisotopes and of antibodies to the substance being investigated.
- suspicious
- suspiciously
- suspiciousness
- suspiration
- suspire
- Susquehanna
- Susquehanna River
- Susquehannock
- suss
- Sussex
- Sussex spaniel
- sustain
- sustainability
- sustainable
- sustained yield
- sustainer
- sustaining pedal
- sustainment
- sustenance
- sustentacular
- sustentacular cell
- sustentation
- sustentative
- Susu
- Susumu