See Also: Pennatula(medicine)

isospin (iou) and Pennatula (medicine)


isospin (iou)



isospin noun. M20.
[Contr. of isotopic spin, isobaric spin.]
Physics. A vector quantity associated with subatomic particles and atomic nuclei, expressing that the strong interaction does not depend on the electric charge, its quantum number (symbol T or I) being so assigned that similar particles differing only in charge-related properties can be treated as different states of a single particle.

Pennatula (medicine)


pennatula


Origin: NL, fr. L. Penna a feather.

<zoology> Any one of numerous species of Pennatula, Pteroides, and allied genera of Alcyonaria, having a featherlike form; a sea-pen. The zooids are situated along one edge of the side branches.

Source: Websters Dictionary