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From The Collaborative International Dictionary of English v.0.48:
Vesicular \Ve*sic"u*lar\, a. [Cf. F. v['e]siculaire.] 1. Of or pertaining to vesicles; esp., of or pertaining to the air vesicles, or air cells, of the lungs; as, vesicular breathing, or normal breathing, in which the air enters freely the air vesicles of the lungs. [1913 Webster] 2. Containing, or composed of, vesicles or vesiclelike structures; covered with vesicles or bladders; vesiculate; as, a vesicular coral; vesicular lava; a vesicular leaf. [1913 Webster] 3. Having the form or structure of a vesicle; as, a vesicular body. [1913 Webster] Vesicular column (Anat.), a series of nerve cells forming one of the tracts distinguished in the spinal cord; -- also called the ganglionic column. Vesicular emphysema (Med.), emphysema of the lungs, in which the air vesicles are distended and their walls ruptured. Vesicular murmur (Med.), the sound, audible on auscultation of the chest, made by the air entering and leaving the air vesicles of the lungs in respiration. [1913 Webster]