Where does “semilunar” come from?

Semilunar comes from English semi- and lunar, combining Latin semi- (half) from Proto-Indo-European sēmi, with Latin lunāris from Proto-Indo-European lewk- (to shine).

semilunar (English): Shaped like a half-moon; crescent-shaped; The...

Definitions

  1. Shaped like a half-moon; crescent-shaped; The...

Ancestry of “semilunar”, step by step

semilunar traces back through two separate lines of ancestry.

via English lunar

StepLanguageWordMeaning
1EnglishlunarOf, pertaining to, or resembling the Moon (that is, Luna, the Earth's moon)
2Middle Englishlunarshaped like the crescent moon
3LatinlunarisOf or pertaining to the moon, lunar
4Normanleunemoon; jellyfish
5Old Frenchlunethe Moon
6Latinlūna
7Old Latinlosna
8Proto-Italiclouksnāmoon
9Proto-Indo-Europeanlówksneh₂moon
10Proto-Indo-Europeanlewḱ-lynx
11Proto-Indo-Europeanlewk-bright; to shine; to see

via French semi-lunaire

StepLanguageWordMeaning
1Frenchsemi-lunairesemilunar
Every word from Proto-Indo-European lewk-Every word from Proto-Indo-European lewḱ-Every word from Proto-Indo-European lówksneh₂