xe·ni·a 
(zēnē-ə, zēnyə)
(zēnē-ə, zēnyə)n.
The effect, such as an increase in size, on the embryo or endosperm of a plant, resulting from fertilization with pollen of a genetically distinct variety.
[New Latin, from Greek xeniā, hospitality, from xenos, guest, stranger; see XENO-.]