macrozamia: any treelike cycad of the genus Macrozamia having erect trunks and pinnate leaves and large cones with sometimes edible nuts; Australia
gymnosperm: plants of the class Gymnospermae having seeds not enclosed in an ovary
osmotic pressure: (physical chemistry) the pressure exerted by a solution necessary to prevent osmosis into that solution when it is separated from the pure solvent by a semipermeable membrane