Plural: apices. The end of something 'protruding from' or 'attached to' the (imaginary) center of the body or the end removed from the center of the body. For example, the end of the wing (apex of the wing), the abdomen (apex of the abdomen), the tibia (apex of the tibia), etc.
A recent Avast update of virus definitions cause a false positive on the site for a trojan. The guilty code was updated but you may have to clear the blocks from Avast.