Dictionary.net

1. Summit of the roof of the fourth ventricle, an angle formed by the union of the anterior and posterior medullary vela pushing up into the substance of the vermis. 2. The acme or height of a fever or any acute disease.

The summit, apex, or ridge of a house or pediment.

The acme ; the highest point.

The angle formed at the point of junction of the velum medullare anterius and the inferior vermiform process.

Of a disease, see acme. [Lat.]

n. [Latin] The ridge or summit of a house or pediment.