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Answer for the clue "Pin of a sundial whose shadow points to the hour ", 6 letters:
gnomon

Alternative clues for the word gnomon

Word definitions for gnomon in dictionaries

Wikipedia Word definitions in Wikipedia
A gnomon ([ˈnoʊmɒn], from Greek , gnōmōn , literally: "one that knows or examines") is the part of a sundial that casts a shadow . The term has come to be used for a variety of purposes in mathematics and other fields.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Gnomon \Gno"mon\, n. [L. gnomon, Gr. ? one that knows, the index of a sundial. See Gnome .] (Dialing) The style or pin, which by its shadow, shows the hour of the day. It is usually set parallel to the earth's axis. (Astron.) A style or column erected ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"vertical shaft that tells time by the shadow it casts" (especially the triangular plate on a sundial), 1540s, from Latin gnomon , from Greek gnomon "indicator," literally "one who discerns," from gignoskein "to come to know" (see gnostic (adj.)).

Usage examples of gnomon.

Shadows cast by innumerable stone towers combed the dark blue water, all pointing in the same transitory direction, as if the stony pinnacles were gnomons to a half-thousand igneous sundials, tracking in unison the serene march of hours, of aeons.

He named stars of the wild goat, or Capricorn, those where the sun, having reached the highest point in his annuary tract, rests at the summit of the horary gnomon, and imitates the goat, who delights to climb the summit of the rocks.

Newton was constructing a sundial on a south-facing wall, using, as gnomon, a slender rod with a ball on the end.