Related Clues:

• Wave producer
• Latin preposition
• Ratio involving a hypotenuse
• Trigonometric term
• ___ wave
• Periodic function
• ___ mora (without delay, in Latin)
• Right triangle ratio
• Trig curve
• __ wave
• Reciprocal of cosecant
• Right triangle figure
• Mathematical ratio
• __ qua non
• --- "qua non"