Relating to, or forming the base or foundation of something. The basal layer of the skin is crucial for regeneration and repair.
Situated at or near the base of a structure, especially in biology. The basal leaves of the plant are larger and broader than those higher up the stem.
Fundamental or essential; serving as a starting point. Understanding basal concepts in mathematics is necessary before advancing to more complex topics.
Physiology: Denoting the minimal or resting level of a bodily process, used as a baseline for measurement. Endocrinologists first establish the patient's basal insulin needs before adding bolus doses.