(aviation, of an aircraft) To enter, or remain in, a spin (abnormal stalled flight mode). / (aviation, of a pilot) To cause one's aircraft to enter or remain in a spin (abnormal stalled flight mode).

A non-existent town included on a map in order to identify cases of plagiarism by others.

Bold or vivid colours; also, clothes, cosmetics, etc., with such colours. / (colloquial, dated) Household utensils (such as cutlery, ornaments, and plate) made of shiny metal.

(immunology) A form of B cell that produces antibodies after having reacted with its specific antigen in follicle centers.