Trayathe means to save, to redeem. TRA for Trayate is eloquent in words like Sastra, saves from ignorance, Putra, saves from hell, Mantra, saves from Enemy Mind et al. Gayath trayate iti Gayatri,it is the mantra which protects the chanter. Where do these definitions come from ? It comes from the Science of Definition, Nirukta Sastra, whose definition is vasti tasya niruktam tu veda nirvachanam sphutam.