What's the difference between chalaza and chalaze?

Chalaza

Definition:

• (n.) The place on an ovule, or seed, where its outer coats cohere with each other and the nucleus.
• (n.) A spiral band of thickened albuminous substance which exists in the white of the bird's egg, and serves to maintain the yolk in its position; the treadle.

Example Sentences:

Chalaze

Definition:

• (n.) Same as Chalaza.

Example Sentences:

• (1) The chalazal halves of ovules of C. media L. 'Citron of Commerce' were used as control repressor source.
• (2) Nucellus cells also stored diverse substances and enzymes especially towards the chalazal end.