1. sympetalous - Adjective
2. sympetalous - Adjective Satellite
Having the petals united; gamopetalous.
Source: Webster's dictionaryDescription The Rubiaceae are morphologically easily recognizable as a coherent group by a combination of characters: opposite leaves that are simple and entire, interpetiolar stipules, tubular sympetalous actinomorphic corollas and an inferior ovary. Source: Internet
The petals are often fused ( sympetalous ) with shapes ranging from narrowly tubular to funnelform or widely bowl-shaped. Source: Internet