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Unijugate
- Having but one pair of leaflets; -- said of a pinnate leaf.
Unilabiate
- Having one lip only; as, a unilabiate corolla.
Uniliteral
- Consisting of one letter only; as, a uniliteral word or sign.
Unilobar
- Consisting of a single lobe.
Unilocular
- Having one cell or cavity only; as, a unilocular capsule or shell.
Unimpairable
- That can not be impaired.
Unimuscular
- Having only one adductor muscle, and one muscular impression on each valve, as the oyster; monomyarian.
Unincumbered
- Not incumbered; not burdened.