- sinus
[sinus 词源字典]
- sinus: see sine
[sinus etymology, sinus origin, 英语词源] - sinus (n.)
- "hollow curve or cavity in the body," early 15c., from Medieval Latin sinus, from Latin sinus "bend, fold, curve, a bent surface; a bay, bight, gulf; a fold in land;" also "fold of the toga about the breast," hence "bosom," and figuratively "love, affection, intimacy; interior, inmost part;" of unknown origin.