- Having a broad base of attachment; not pedunculated. [L. sessilis, low-growing, fr. sedeo, pp. sessus, to sit]
* * *ses·sile 'ses-īl, -əl adj1) attached directly by a broad base: not pedunculated <a \sessile tumor>2) firmly attached (as to a cell): not free to move about <\sessile antibodies>
* * *adj.(of a tumour) attached directly by its base without a peduncle (stalk).
* * *ses·sile (sesґil) [L. sessilis] attached by a base; not pedunculated or stalked.
Medical dictionary. 2011.