For those wanting to know what the new Snapchat emoji symbols mean, there is several different things that they repersent and these emojis have replaced the âBest Friendsâ feature with Friend Emojis smilies.
(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.
It is a group of four things, like cells, spores, anything biological. I would recommend looking at Wikipedia for more examples. A tetrad is a group of four. Tetrad (astronomy), an occurrence of 4 total lunar eclipses in a row with intervals of 6 lunations (semester).