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(plural tetrads) 1  A group of four things. ( 2 chemistry) A tetravalent atom or radical. ( biology) Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.
Best Answer: The molecular geometry simply refers to the shape of the molecule without taking into account the lone pairs of electrons, which is what your professor was asking. Tetrahedral is the geometry when the lone pairs are considered, called the electron-pair geometry.Source(s):etrahedral is the geometry when the lone pairs are considered, called the electron-pair geometry.