gy·rus 
(jīrəs)
(jīrəs)n. pl. gy·ri (-rī′)
A rounded ridge, as on the surfaces of the cerebral hemispheres.
[Latin gȳrus, circle; see GYRE.]
- unicuspid
- unicycle
- unicyclist
- unidentified flying object
- unidimensional
- unidirectional
- unidirectionality
- unidirectionally
- uniface
- unifacial
- unifacially
- unifactorial
- unifiable
- unification
- Unification Church
- unified field theory
- unifier
- unifilar
- unifloral
- unifoliate
- unifoliolate
- uniform
- uniformitarian
- uniformitarianism
- uniformity