cha·la·za (k -l  z, -l z)n. pl. cha·la·zae (-z  ) or cha·la·zas 1. Biology One of two spiral bands of tissue in an egg that connect the yolk to the lining membrane at either end of the shell. 2. Botany The region of an ovule that is opposite the micropyle, where the integuments and nucellus are joined. [Greek khalaza, hard lump, hailstone.] cha·la zal adj. |
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