(pathology) A type of teratoma or tumour, usually benign. It is in the form of a cyst or sac, and contains skin and sometimes hair, nails, teeth or other tissue.

(music) A type of cymbal, the function of which is to maintain a steady rhythmic pattern.

(cycle racing) A form of cycling on a specially-designed track, especially, a velodrome

(obsolete, rare) A “head” (of unexpanded leaves, etc.); an opening bud.

Misspelling of senna.

(economics) A long-term fluctuation in economic activity between growth and recession.

plural of cycle lane

The periodic alternation in the use of the left or the right nostril more actively for breathing, occurring in humans, caused by periodic swelling of the nasal conchae on one side of the nose and its reversal.

plural of cyclic nucleotide

(graph theory) A Hamiltonian path with an additional connection between the first and last vertices visited, forming a cycle.