a·pet·al·ous 
(ā-pĕtl-əs)
(ā-pĕtl-əs)adj.
Having no petals: an apetalous floret.
a·petal·y (ā-pĕtl-ē) n.
- ultraconservative
- ultradian
- ultrafiltration
- ultrahigh
- ultrahigh frequency
- ultraism
- ultraist
- ultraliberal
- ultralight
- ultralow frequency
- ultraluxe
- ultramafic
- ultramarathon
- ultramarathoner
- ultramarine
- ultramicrometer
- ultramicroscope
- ultramicroscopic
- ultramicroscopy
- ultramicrotome
- ultramicrotomy
- ultraminiature
- ultraminiaturization
- ultraminiaturize
- ultramodern