Sine
/ˈsaɪni/noun
A mathematical function that relates the angle of a triangle to the ratio of the length of the opposite side to the hypotenuse.
Did you know?The word 'sine' comes from a Latin mistranslation of an Arabic term that originally described a 'bay' or 'fold', linking it to ancient navigation and cosmic understanding.
Etymological Timeline
Proto-Indo-European
PIE
*sinew-
“Relating to the connective tissue, symbolizing strength and tension.”
Sanskrit
Sanskrit
सिन्धु (sindhu)
“A term for 'river', indicating a flow or connection.”
Arabic
Arabic
جَيْب (jayb)
“Meaning 'fold' or 'bay', referring to the curved shape.”
Latin
Latin
sinus
“Meaning 'bay' or 'fold', often used in geometry and mathematics.”
Medieval Latin
Medieval Latin
sinus
“Adopted into mathematical contexts, referring to the shape of waves.”
16th Century
English
sine
“Used in mathematical contexts to describe the ratio in trigonometry.”
Modern English
English
sine
“The established mathematical term used in trigonometric functions.”