- Botany. attached by the base, or without any distinct projecting support, as a leaf issuing directly from the stem.
- Zoology. permanently attached; not freely moving.
Origin of sessile
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for sessile
The peridium is globe-shaped, sessile, without a stem-like base.
This plant is sessile or nearly so, growing on the ground in dense clusters.
The plant is sessile and quite strongly rooted with fine rootlets.
When either the flowers or the clusters are without stems, they are said to be sessile.
Leaves or leaflets are sessile when they have no stems, and petiolate when they have stems.
- (of flowers or leaves) having no stalk; growing directly from the stem
- (of animals such as the barnacle) permanently attached to a substratum
C18: from Latin sēssilis concerning sitting, from sedēre to sit
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for sessile
1725, "adhering close to the surface," from Latin sessilis "pertaining to sitting, for sitting on," from sessum, past participle of sedere "to sit" (see sedentary). In botany from 1753. Meaning "sedentary" first recorded 1860.
Online Etymology Dictionary, © 2010 Douglas Harper
- Permanently attached or fixed; not free-moving.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- Permanently attached or fixed and not free-moving, as corals and mussels.
- Stalkless and attached directly at the base, as certain kinds of leaves and fruit.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.