Pentad is a 6 letter English word. It's valid Scrabble word worth 9 points. It's valid Words with friends word worth 11 points.
You can make 136 anagrams from letters in pentad (adenpt).
1645-55; Greek pentad- (stem of pentás) group of five. See pent(a)-, -ad1
Nitrogen in the triad condition in the amines is far less poisonous than in the pentad condition.
There is something to be said for this view, but on the whole the balance of the evidence is in favor of nitrogen being a pentad.
In 1820, he added to the last a pentad, so that the whole list amounted to sixty-five.
Five, or the pentad, is everything; it stops the power of poisons, and is dreaded by evil spirits.
But this oddness belongs to other numbers also (pentad, heptad, &c.).
The structure of Aristotle's pentad for five act plays is useful as a framework for solving personal problems.