\Chal`a*zog"a*my\, n. [Chalaza + -gamy, as in
polygamy.] (Bot.)
A process of fecundation in which the pollen tube penetrates
to the embryosac through the tissue of the chalaza, instead
of entering through the micropyle. It was originally
discovered by Treub in {Casuarina}, and has since been found
to occur regularly in the families {Betulace[ae]} and
{Juglandace[ae]}. Partial chalazogamy is found in {Ulmus},
the tube here penetrating the nucleus midway between the
chalaza and micropyle. -- {Chal`a*zo*gam"ic}, a.