[ses-il, -ahyl]
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.

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

sessility [se-sil-i-tee] , noun
pseudosessile, adjective
subsessile, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sessile (ˈsɛsaɪl)
1.  (of flowers or leaves) having no stalk; growing directly from the stem
2.  (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 10th Edition
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Word Origin & History

1725, "adhering close to the surface," from L. sessilis "pertaining to sitting," from sessum, pp. of sedere "to sit" (see sedentary). Meaning "sedentary" first recorded 1860.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sessile ses·sile (sěs'īl', -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.
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American Heritage
Science Dictionary
sessile   (sěs'īl')  Pronunciation Key 

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  1. Permanently attached or fixed and not free-moving, as corals and mussels.

  2. Stalkless and attached directly at the base, as certain kinds of leaves and fruit.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The sessile filter feeding organisms inhabit the wave exposed shores.
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