Where does “cmH2O” come from?

cmH2O (Translingual) comes from Translingual cm, from Translingual c-, from English centi-, from French centi-, from Latin centi-, from Latin centum, from Latin folium, from Proto-Italic *foljom.

Ancestry of “cmH2O”, step by step

cmH2O traces back through two separate lines of ancestry.

via Translingual cm

StepLanguageWordMeaning
1Translingualcm
2Translingualc-
3Englishcenti-API; hundred; one-hundredth; In the International...
4Frenchcenti-centi
5Latincenti-one hundred-, hundred-; "indicates a count of one...
6Latincentuma hundred; 100
7Latinfoliuma leaf; a petal; a sheet or leaf of paper
8Proto-Italic*foljom
9Proto-Indo-Europeanbʰolh₃yomleaf
10Proto-Indo-Europeanbʰleh₃-bloom, flower
11Proto-Indo-Europeanbʰel-to sound; to speak, roar, bark; shiny, white; to...
12Proto-Indo-Europeanbʰōl-

via Translingual H2O

StepLanguageWordMeaning
1TranslingualH2O
Every word from Proto-Indo-European bʰōl-Every word from Proto-Indo-European bʰel-Every word from Proto-Indo-European bʰleh₃-