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.
Tetra is no longer a taxonomic, phylogenetic term. It is short for Tetragonopterus, a genius name formerly applied to many of these fish, which is Greek for square-finned (literally, four-sided-wing).