• synonyms


[ ses-il, -ahyl ]
/ ˈsɛs ɪl, -aɪl /


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.

Nearby words

sesquioxide, sesquipedalian, sesquiplane, sesquiterpene, sesshu, sessile, sessile oak, sessility, session, session musician, sessional indemnity

Origin of sessile

1715–25; < Latin sessilis fit for sitting on, low enough to sit on, dwarfish (said of plants), equivalent to sess(us) (past participle of sedēre to sit1) + -ilis -ile
Related formsses·sil·i·ty [se-sil-i-tee] /sɛˈsɪl ɪ ti/, nounpseu·do·ses·sile, adjectivesub·ses·sile, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for sessile

British Dictionary definitions for sessile


/ (ˈsɛsaɪl) /


(of flowers or leaves) having no stalk; growing directly from the stem
(of animals such as the barnacle) permanently attached to a substratum
Derived Formssessility (sɛˈsɪlɪtɪ), noun

Word Origin for sessile

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

Medicine definitions for sessile


[ sĕsīl′, -əl ]


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.

Science definitions for sessile


[ sĕsīl′ ]

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.