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.
noun (pl) -zas, -zae (-ziː)
one of a pair of spiral threads of albumen holding the yolk of a bird’s egg in position
the basal part of a plant ovule, where the integuments and nucellus are joined
Plural chalazae (kə-lā’zē) or chalazas
One of two spiral bands of tissue in an egg that connect the yolk to the lining membrane at either end of the shell.
The region of a plant ovule that is opposite the micropyle, where the integuments and nucellus are joined.
Ophthalmology. sty2 . noun a small cyst on the eyelid resulting from chronic inflammation of a meibomian gland Also called meibomian cyst n. small tumor in the eyelid, 1708, from Greek khalazion, diminutive of khalaza “hail, hailstone; small lump or knot; pimple,” from PIE root *gheled- “hail.”
Mineralogy. blue vitriol. noun a blue secondary mineral consisting of hydrated copper sulphate in triclinic crystalline form. Formula: CuSO4.5H2O
a microcrystalline, translucent variety of quartz, often milky or grayish. noun (pl) -nies a microcrystalline often greyish form of quartz with crystals arranged in parallel fibres: a gemstone. Formula: SiO2 n. c.1300, from Latin calcedonius, in Vulgate translating Greek khalkedon in Rev. xxi:19, found nowhere else. Connection with Chalcedon in Asia Minor “is very doubtful” […]
an ancient city in NW Asia Minor, on the Bosporus, opposite Byzantium. Council of, the ecumenical council held there in a.d. 451.