Hiver - Hiver is the French word for winter.

Radar Echo - Microwaves scattered by distant rain or snow back to the receiver where they are displayed as bright spots on a cathode ray tube.

Frontolosis - The dissipation of a frontal zone due to a weakening contrast between two air masses. The temperature gradient weakens during frontolysis, meaning the rate of change of the temperature along the frontal boundary is lessening. At the end of frontolysis, the front no longer exists. The opposite of frontolysis is frontogenesis.

Trough - An sharpened zone of cyclonic wind change usually associated with a zone of lower pressure, and can occur many places without actually becoming a front (lee-side a mountain chain, behind frontal zones, etc)

Rainbow - An arc of concentric colored bands formed by refraction and internal reflection of sunlight by falling raindrops

Zodiacal Light - Is a softly luminous cone of white light visible from an hour or so after sunset or before dawn

Trowal - A trough of warm air aloft. It is usually a similar type of frontal structure as an occlusion, but not always. The term more used abroad than in the US.