Vehāyasa = vihāyasa, i.e. air, sky; only used in accusative vehāyasaṃ in function of a locative (cf. Vv-a 182: vehāyasaṃ = vehāyasa-bhūte hatthi-piṭṭhe), combined with ṭhita (standing in the air) Vv 41; Mhv I, 24; Pv-a 14.
(masc, masc, from vehāsa) air; sky; heaven Construction: vehāsa + ya > vehāyasa