Source etymology 1
Original entry ↗The sixteenth letter of the Classical and Modern Greek alphabets and the seventeenth in Old Greek. · An irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its diameter; approximately 3.14159265.
From Koine Greek πῖ (pî), from Ancient Greek πεῖ (peî), ultimately from Proto-Semitic *pay- (“mouth”). Doublet of pe. Its mathematical use apparently stems from its use as the first letter in περιφέρεια (periphéreia, “periphery; circumference”) and was first cited in 1706 in the Synopsis Palmariorum Matheseos by William Jones.
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"templates": [
{
"name": "der",
"args": {
"1": "en",
"2": "grc-koi",
"3": "πῖ"
},
"expansion": "Koine Greek πῖ (pî)"
},
{
"name": "der",
"args": {
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"3": "πεῖ"
},
"expansion": "Ancient Greek πεῖ (peî)"
},
{
"name": "der",
"args": {
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"2": "sem-pro",
"3": "*pay-",
"4": "",
"5": "mouth"
},
"expansion": "Proto-Semitic *pay- (“mouth”)"
},
{
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[
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[
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]
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"descendants": [],
"lexical": [
{
"pos": "noun",
"glosses": [
"The sixteenth letter of the Classical and Modern Greek alphabets and the seventeenth in Old Greek.",
"An irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its diameter; approximately 3.14159265."
],
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