BUTTON n.
A globule of metal remaining onan assay cupel or in a crucible, after fusion. Button hook, a hook for catching a button and drawing it through a buttonhole, as in buttoning boots and gloves. -- Button shell (Zoöl.), a small, univalve marine shell of the genus Rotella. -- Button snakeroot. (Bot.) (a) The American comp…
FATTY a.
ys. See under Clay. -- Fatty degeneration (Med.), a diseased condition, in which the oil globules, naturally present in certain organs, are so multiplied as gradually to destroy and replace the efficient parts of these organs. -- Fatty heart, Fatty liver, etc. (Med.), a heart, liver, etc., which have been the subject…
POLAR a.
is white, tinged with yellow. Called also White bear. See Bear. -- Polar body, cell, or globule (Biol.), a minute cell which separates by karyokinesis from the ovum during its maturation. In the maturation of ordinary ova two polar bodies are formed, but in parthogenetic ova only one. The first polar body formed is u…