fissūra — Lewis & Short
fissūra, ae, f.findo;
I a cleft, chink, fissure (post-Aug.):
quorum in digitos pedum fissura divisa est,Plin. 10, 63, 83, § 176:
vitis,Col. 4, 29, 4.—In plur., Plin. 33, 6, 33, § 101:
efficax asini sevum labrorum fissuris,chapped lips, id. 28, 12, 50, § 188.