English Explanatory Dictionary

umbra recta

English dictionary entry

Meanings

noun
  1. On a shadow in the shape of a right triangle, the length of the shadow's edge adjacent to a measured angle.

Pronunciation

ŭmʹbrə rĕkʹtə /ˈʌmbɹə ˈɹɛktə/

Word forms

umbra recta

Etymology

First attested in Modern English in 1688, although the phrase was also used in Middle English by Geoffrey Chaucer (c. 1343–1400) in his Treatise on the Astrolabe; Latin: umbra (“shadow”) + rēcta (feminine nominative singular of rēctus, “straight”) = “straight shadow”; compare umbra versa.

Synonyms

umbra extensa
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