Umbilical

google

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mid 16th century: from French ombilical, or based on Latin umbilicus (see umbilicus).

wiktionary

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Formed from Latin umbilicus(“navel”) + the suffix -al.

etymonline

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umbilical (adj.)

"pertaining to the navel," 1540s, from Medieval Latin umbilicalis "of the navel," from Latin umbilicus "navel" (see umbilicus). Umbilical cord attested by 1753 (the native term is navel string).