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The Collaborative International Dictionary
Sessile

Sessile \Ses"sile\, a. [L. sessilis low, dwarf, from sedere, sessum, to sit: cf. F. sessile.]

  1. Attached without any sensible projecting support.

  2. (Bot.) Resting directly upon the main stem or branch, without a petiole or footstalk; as, a sessile leaf or blossom.

  3. (Zo["o]l.) Permanently attached; -- said of the gonophores of certain hydroids which never became detached.

Douglas Harper's Etymology Dictionary
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.

Wiktionary
sessile

a. 1 (context zoology English) permanently attached to a substrate; not free to move about; “an attached oyster” 2 (context botany English) attached directly by the base; not having an intervene stalk.

WordNet
sessile
  1. adj. permanently attached to a substrate; not free to move about; "an attached oyster"; "sessile marine animals and plants" [syn: attached] [ant: vagile]

  2. attached directly by the base; not having an intervening stalk; "sessile flowers"; "the shell of a sessile barnacle is attached directly to a substrate" [syn: stalkless] [ant: pedunculate]

Usage examples of "sessile".

These probably sink down besmeared with the secretion and rest on the small sessile glands, which, if we may judge by the analogy of Drosophyllum, then pour forth their secretion and afterwards absorb the digested matter.

If all pedunculated cirripedes had become extinct, and they have already suffered far more extinction than have sessile cirripedes, who would ever have imagined that the branchiae in this latter family had originally existed as organs for preventing the ova from being washed out of the sack?

So again the two main divisions of cirripedes, the pedunculated and sessile, which differ widely in external appearance, have larvae in all their several stages barely distinguishable.

Warner, in a report of the examination of 50,000 children, quoted by Ballantyne, describes 33 with supernumerary auricles, represented by sessile or pedunculated outgrowths in front of the tragus.

They were then placed on the small sessile glands, which being thus stimulated secreted copiously in the course of 7 hrs.

But the sessile glands differ in one important respect, for they never secrete spontaneously, as far as I have seen, though I have examined them under a high power on a hot day, whilst the glands on pedicels were secreting copiously.

The parent form of Dionaea and Aldrovanda seems to have been closely allied to Drosera, and to have had rounded leaves, supported on distinct footstalks, and furnished with tentacles all round the circumference, with other tentacles and sessile glands on the upper surface.

Bosquet, sent me a drawing of a perfect specimen of an unmistakeable sessile cirripede, which he had himself extracted from the chalk of Belgium.

And, as if to make the case as striking as possible, this sessile cirripede was a Chthamalus, a very common, large, and ubiquitous genus, of which not one specimen has as yet been found even in any tertiary stratum.

The upper surface of the lobes, as already stated, is thickly covered with small purplish, almost sessile glands.

Jacen Solo, it was forced to generate a shadow shape using the infrared-sensitive eyespots of the sessile polyps in the amphistaff grove.

Ultimately from sessile types that break down ores, manufacture the basic alloys, and concentrate more dielectric energy than they use.

We even built a prototype before Caliban, a sessile testbed unit, and gave it to Gubber to test in a double-blind setup.

All Gubber knew was that we wanted him to display a series of situation simulations--essentially holographic versions of the same situations we wanted Caliban to confront--to the sessile free-matrix testbed unit, alongside a normally programmed Three Law sessile testbed.

The small sessile glands have also disappeared in some of the genera, being replaced in Roridula by hairs, and in most species of Drosera by absorbent papillae.