Postural means about the way you hold your body when you sit, stand, or walk. A doctor may talk about postural problems if someone’s back hurts from sitting in a bent way. Postural muscles are the ones that keep you upright. In clinic English, postural hypotension is a drop in blood pressure when you stand up too fast, which can make you dizzy. It is a health and body-training word. You will see it in physio rooms and medical notes more than in friendly chat. Though actually, it looks like the other post- words in this list, but it is not post- plus something. It is posture plus -al. And it almost always stays with the body. When people talk about a “posture” as a proud or stiff attitude, they rarely make the adjective postural from that stretch.