chalasia cha·la·sia (kə-lā’zē-ə, -zhə) or cha·la·sis (-lā’sĭs) n. The inhibition and relaxation of a previously sustained contraction of a muscle or synergistic group of muscles, such as the cardiac sphincter.
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 […]
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