(pathology) The sudden and unexplained death of an infant aged one month to one year, normally while sleeping.

(meteorology, informal) A supercell thunderstorm whose radar signature resembles that of a hurricane, with a center free of precipitation; a landphoon.

(US) (usually) a paved footpath located at the side of a road, for the use of pedestrians / (US, by extension) any paved footpath, even if not located at the side of a road

(biochemistry) Any of several forms of rhodopsin activated by light