from The Century Dictionary.
- In botany, of or pertaining to a receptacle.
- In zoology and anatomy, serving as a receptacle or reservoir; pertaining to a receptaculum.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Bot.) Pertaining to the receptacle, or growing on it.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective botany Pertaining to, or growing in, the
from Wiktionary, Creative Commons Attribution/Share-Alike License
The position of the spur in a line with the posterior sepal has led many botanists to consider it as a process of that sepal, but the fact of its being situated within the insertion of the petals is conclusive as to its receptacular origin.
 See also the receptacular tube (ovary?) of _Bæckea_ bearing stamens, see p. 183.
And, indeed, in many of these cases it would be impossible to say where the axial or receptacular portion ended, and the foliar portion began.