1. Pertaining to flowerless plants (ferns or mosses) in which growth occurs only at the tip of the main stem
   - acrogenous

See also: acrogen

• Oryctolagus
• Oryctolagus cuniculus
• oryx
• Oryx gazella
• Oryza
• Oryza sativa
• Oryzomys
• Oryzomys palustris
• Oryzopsis
• Oryzopsis hymenoides
• Oryzopsis miliacea
• orzo
• os
• os breve
• os capitatum
• os frontale
• os hamatum
• os hyoideum
• os ischii
• os longum
• os lunatum
• os nasale
• os palatinum
• os pisiforme
• os pubis