The thickening of a membrane closing a wood-cell pit (as of gymnosperm tracheids) having the secondary cell wall arched over the pit cavity.
A rounded ridge of bone or muscle, especially one on the occipital bone.
{{lb|en|topology|in combination|n-torus|4-torus|etc.}} The product of the specified number of circles.
A topological space which is a product of two circles.
A large convex molding, typically semicircular in cross section, which commonly projects at the base of a column and above the plinth.
The end of the peduncle or flower stalk to which the floral parts (or in the Asteraceae, the florets of a flower head) are attached.
A ring-shaped object, especially a large ring-shaped chamber used in physical research.
A membrane-bound compartment found in a cell.
A small sac or cyst or vacuole, especially one containing fluid. A blister formed in or beneath the skin, containing serum. A bleb.
(usually and especially) Such a blister that is less than 5 mm in diameter.
A small cavity formed in volcanic rock by entrapment of a gas bubble during solidification.
A small sac filled with juice, one of many constituting the pulp of a fruit such as an orange, lemon, or grapefruit.
A pocket of embryonic tissue that is the beginning of an organ.