UMBIL'ICAL, adjective [Latin umbilicus, the navel.] Pertaining to the navel; as umbilical vessels; umbilical region. Umbilical points, in mathematics, the same as foci. Umbilical vessels, in vegetables, are the small vessels which pass from the heart of the seed into the side seed-lobes, and are supposed to imbibe the saccharine, farinaceous or oily matter which is to support the new vegetable in its germination and infant growth.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI