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Uni-
- A prefix signifying one, once; as in uniaxial, unicellular.
Uniaxial
- Having but one optic axis, or line of no double refraction.
Unibranchiate
- Having but one gill, as certain molluscs.
Unicapsular
- Having but one capsule to each flower.
Unicarinated
- Having one ridge or keel.
Unicentral
- Having a single center of growth.
Unicity
- The condition of being united; quality of the unique; unification.