raiar

• (Paulista) IPA^(key): /ʁaj.ˈa(ɾ)/, /ʁaj.ˈa(ɹ)/
• (South Brazil) IPA^(key): /haj.ˈa(ɾ)/, /haj.ˈa(ɻ)/
• (Portugal) IPA^(key): /ʁaj.ˈaɾ/

Raio (“ray”) +‎ -ar, perhaps corresponding to Latin radiō, radiāre, and thus a doublet of radiar. Compare Spanish rayar, Italian raggiare.

raiar (first-person singular present indicative raio, past participle raiado)

1. to light up; to illuminate; to shine
2. (intransitive, of the day or the morning) to break; to arrive

   Antes do dia raiar.

   Before the day breaks.

• (to illuminate): iluminar
• (to break): amanhecer, clarear, nascer

• rádio
• raio

Raia (“scratch”) +‎ -ar.

raiar (first-person singular present indicative raio, past participle raiado)

1. to draw lines or a line
2. to groove (to carve grooves in)

• (to draw lines): riscar
• (to groove): sulcar

• raia
• raiado