chalaza

/kuh-ley-zuh/US // kəˈleɪ zə //UK // (kəˈleɪzə) //

恰拉扎,恰拉萨,恰拉恰,恰恰相反

Definitions

n.名词 noun

1
plural cha·la·zas, cha·la·zae [kuh-ley-zee]. /kəˈleɪ zi/.
- : Zoology. one of the two albuminous twisted cords which fasten an egg yolk to the shell membrane.
- : Botany. the point of an ovule or seed where the integuments are united to the nucellus.

He considers the centre of the hilum as the base, and the chalaza, where it exists, as the natural apex of the seed.
Seeds larger than Aestivalis, pear-shaped; chalaza roundish.
Seeds large, usually slightly notched; chalaza rather narrow; raphe a groove.
Seeds small to very small, slightly notched on top; chalaza depressed, oblong-oval; raphe broad, slightly distinct.
Seeds two to three of medium size; chalaza oval in shape, slightly distinct; raphe flat, usually inconspicuous, rarely prominent.