Word of the day

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penumbra (noun) – 1. A partial shadow, as in an eclipse, between regions of complete shadow and complete illumination.
2. The diffuse outer part of a sunspot.
3. An area in which something exists to a lesser or uncertain degree.
4. An outlying surrounding region; a periphery:

Source : The Free Dictionary

Etymology : The noun penumbra is composed of the Latin adverb paene ?almost? and the Latin noun umbra ?shadow.? Paene is not usual in Latin compounds, the most frequent being paeninsula (paeneinsula) ?peninsula? and paenultimus (p?nultimus) ?almost last, second last,” especially the ?second last syllable? (penultimate is often misused in English to mean ?ultimate, last?). Penumbra (paenumbra) does not occur in Classical or Medieval Latin; it is a New Latin coinage by the German mathematician and astronomer Johann Kepler (1571-1630). Penumbra entered English in the 17th century.