pəˌnachəˈlāshēə noun plural
Usage: capitalized
Etymology: New Latin, from Pennatula + -acea
: an order of Alcyonaria including the sea pens, sea pansies, and related forms that develop a colony which usually resembles a feather, leaf, or club, is often more or less bilaterally symmetrical with the polyps arranged along the distal part of a central axis or on lateral branches and has the basal end of the axis destitute of polyps and embedded in the mud of the sea bottom
• pen·nat·u·la·cean ̷ ̷| ̷ ̷ ̷ ̷|lāshən adjective or noun
• pen·nat·u·la·ceous -shəs adjective