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.
Tetrapod means 4-legged, or, more precisely, 4-limbed. Dogs are tetrapods; so are humans and birds. Fish aren't tetrapods, because they lack arms or legs. However, snakes are considered tetrapods because their ancestors had four legs and were part of the tetrapod lineage.ogs are tetrapods; so are humans and birds. Fish aren't tetrapods, because they lack arms or legs. However, snakes are considered tetrapods because their ancestors had four legs and were part of the tetrapod lineage.