Etymology
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Words related to anus

anal (adj.)

1769, from Modern Latin analis "of the anus;" see anus. Anal-retentive is attested by 1957 in psychological jargon. Anal sex attested as such from 1966.

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annelid (n.)

"segmented worm," 1834, from French annélide, source of the phylum name Annelida, coined 1801 in Modern Latin by French naturalist J.B.P. Lamarck, from annelés "ringed ones" (from Latin anulus "little ring," a diminutive of anus "ring;" see anus) + Greek eidos "form, shape" (see -oid).

annular (adj.)

"ring-shaped," 1570s, from French annulaire (16c.) or directly from Medieval Latin annularis "pertaining to a ring," from annulus, misspelled diminutive of Latin anus "ring" (see anus).

An annular eclipse (1727) is one in which the dark body of the moon is smaller than the disk of the sun, so that at the height of it the sun, due to the moon's remoteness from Earth, appears as a ring of light. Related: Annularity.

annulus (n.)
1560s in medical use, "ring-like area or space," from a Medieval Latin misspelling of Latin anulus "little ring, finger ring," a diminutive of anus "ring" (see anus).