See Also: obstacle(medicine)
obstacle(1)(dictionary)
obstacle(2)(dictionary)
obstacle course(dictionary)
obstacle(dictionary)
obstacle sense(medicine)
obstacle race(dictionary)
Obstacle - Equestrian Sports(gambling)

pyrimidine (iou) and obstacle (medicine)


pyrimidine (iou)



pyrimidine noun. L19.
[formed as PYRIDINE with inserted -im (from IMIDE).]
Chemistry. A basic colourless solid, C4H4N2, which is a diazine with the nitrogen atoms separated by one carbon atom; any compound containing this ring structure, esp. (also pyrimidine base) any of the nucleotide-forming bases cytosine, thymine, and uracil.

obstacle (medicine)


obstacle


That which stands in the way, or opposes; anything that hinders progress; a hindrance; an obstruction, physical or moral. "If all obstacles were cut away. And that my path were even to the crown." (Shak)

Synonym: Impediment, obstuction, hindrance, difficulty. See Impediment, and Obstruction.

Origin: F, fr. L. Obstaculum, fr. Obstare to withstand, oppose; ob (see Ob-) + stare to stand. See Stand. And cf. Oust.

Source: Websters Dictionary