basal
bas.al \'ba-s*l, -z*l\ \-e-\ aj 1a: relating to, situated at, or forming the base 1b: arising from the base of a stem {~ leaves} 2a: of or relating to the foundation, base, or essence : FUNDAMENTAL)M 2b: of, relating to, or essential for maintaining the fundamental vital ac tivities of an organism : MINIMAL - ba.sal.ly av