This is the 5457th most frequent Spanish word.
olas
Waves.
Here, 'olas' is used to describe the natural waves found in the sea or ocean.
Las olas del mar son muy altas hoy.
The waves of the sea are very high today.
In this sentence, 'olas' metaphorically describes the motion of waving a hand.
Ella saludó con olas de la mano a sus amigos.
She waved her hand to greet her friends.
'Olas' is used figuratively here to describe intense episodes of weather conditions, specifically heat in this case.