See Also: Herbal medicine (botanical medicine, herbology, phytomedicine)(health)
companion(dictionary)
COMPANION, dom(law)
companion(2)(dictionary)
companion(1)(dictionary)
boon companion(dictionary)
companion cell(medicine)
Companion of Honour, the(dictionary)
companion vein(medicine)
Companion bonds(money)

companion cell (medicine) and walk-on (iou)


companion cell (medicine)


companion cell
<plant biology> Relatively small plant cell, with little or no vacuole, found adjacent to a phloem sieve tube and originating with the latter from a common mother cell.

Thought to be involved in translocation of sugars in and out of the sieve tube.


walk-on (iou)



walk-on noun & adjective. E20.
[from walk on s.v. WALK verb1.]
A. noun.
A dramatic role with little or no speaking. E20.
Video for You His parts were seldom more than walk-ons.
b. An actor playing such a role. M20.
Sport. A member of a Sports team who has no regular status. US. L20.
b. adjective.
Of, pertaining to, or designating an airline service not requiring prior booking. M20.
D. Lodge Skytrain, the walk-on, no-reservation service.
Of, pertaining to, or designating a dramatic role with little or no speaking; transf. unimportant, insignificant. M20.
J. Sutherland Humphry Ward has a walk-on part in literary history.