from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Botany Stalkless and attached directly at the base: sessile leaves.
- adj. Zoology Permanently attached or fixed; not free-moving: a sessile barnacle.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. permanently attached to a substrate; not free to move about; “an attached oyster”
- adj. attached directly by the base; not having an intervening stalk.
from the GNU version of the Collaborative International Dictionary of English
- adj. Attached without any sensible projecting support.
- adj. Resting directly upon the main stem or branch, without a petiole or footstalk.
- adj. Permanently attached; -- said of the gonophores of certain hydroids which never became detached.
from The Century Dictionary and Cyclopedia
- In botany, attached without any sensible projecting support; sitting directly on the body to which it belongs without a support; attached by the base: as, a sessile leaf, one issuing directly from the main stem or branch without a petiole or footstalk; a sessile flower, one having no peduncle; a sessile stigma, one without a style, as in the poppy.
- In zoöl. and anatomy:
- Seated flat or low; fixed by a broad base; not stalked or pedunculated.
- Fixed; not free; sedentary.
- Specifically, in Crustacea: Having no peduncle, as a cirriped; belonging to the Sessilia. Having no stalk or ophthalmite, as an eye.
- In conchology, having no stalk or ommatophore, as an eye.
- In entomology, not petiolate, as an abdomen.
- In Hydroida, not detachable or separable, as a gonophore.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. attached directly by the base; not having an intervening stalk
- adj. permanently attached to a substrate; not free to move about
Latin sessilis, low, of sitting, from sessus, past participle of sedēre, to sit.(American Heritage® Dictionary of the English Language, Fourth Edition)
From New Latin sessīlis ("sitting"), from sessus, perfect passive participle of verb sedēre ("sit"), + adjective suffix -īlis. Compare session. (Wiktionary)