A tubular organ enveloping another organ; (in grasses or palms) the tubular part of the leaf enveloping the stem.
The basal portion of a leaf that surrounds the stem.
A tubular envelope extending downward from the base of a leaf blade or leaf stalk and covering the plant stem. A characteristic of all grasses and grasslike plants as well as many other plant families such as Heliconiaceae, Costaceae, Bromeliaceae, Apiaceae, and Marantaceae.
A tubular or half-tubular organ enveloping or clasping another organ.
An organ, usually vaguely leaf like, that encloses another, such as a shoot or cluster of flower buds. The sheath that encloses the buds of an agapanthus is an example.
Any aerial pan of a plant that bears leaves.
In anatomy, the inner lining of the vagina.
A layer of tissue which surrounds a muscle or a bundle of nerve fibres.
The expanded base of a leaf that wraps around the stem or shoot tip; a large bract that encloses a group of flowers in bud, as in the onion inflorescence.
Tubular structure surrounding an organ or body part (e.g., synovial sheath of some tendons).
The layer of connective tissue that envelops structures such as nerves, arteries, tendons, and muscles.
A covering structure of connective tissue, usually of an elongated part, such as the membrane covering a muscle.