Definitions

1. adjective

Having flowers with three styles, especially referring to plants that have bisexual flowers with three stigmas and three stamens.

“The tristylous flowers of the orchid species are an interesting aspect of its reproductive biology.”

2. noun

A plant with tristylous flowers, especially one that has bisexual flowers with three stigmas and three stamens.

“The tristylous orchid is a rare species found in tropical regions.”