ULNA is one of the bones in your arm. It's the thinner and longer bone opposite the thumb. When talking about it clinically, ULNAR means "of or around the Ulna". And more than one are ULNAE. Those are all classic Latin word endings.
A quick shift of letters gives LUNA (the Moon), and if you're talking about the Moon, those things are LUNAR features. The superstitious link between the full moon and strange human behavior leads to LUNACY (behavior caused by the Moon) and being a downright LUNATIC (a person supposedly stricken by LUNAR impulses). A full cycle of the moon (a month) is a LUNATION.
I thought that LUNE word be another word for lunation (month), but it's actually from geometry: a specific curve between two circular arcs, as one circle has a greater diameter than the other the result is shaped like a crescent Moon. A Moon-shaped object is LUNATE, including a specific bone in your wrist.
Note that Luna is a Latin name for our Moon, so it only applies to our Moon. Technically, Luna was the Roman goddess of the Moon, related to the Greek goddess Selene, so when we call the Moon "Luna", I suppose we are waxing (a lunar pun!) poetic. Moons of other planets are not Lunas, they are just moons (not even captitalized). More than one Moon would be LUNAE, but there is only one Luna ... some of the confusion comes from "luna" (lowercase) being used through the centuries for the Moon or a planet or even stars.
There is a certain amount of linguistic Zen that comes from playing simple word unscrambler games, spinning around the question of why some words are accepted and others are not. A few nights back we played UNRULY, and for fun, I tried RULY on a whim, and the game accepted it, when I know other games have rejected it. I tried explaining it to Anne. It felt like a word to me, and it's in Merriam-Webster with the same example I thought of at the time: "I have seen some ruly crowds." It turns out that MW has a fascinating story about these two words, see here . "Ruly" did exist for centuries, got replaced by UNRULY, only to come back as a back-formation from UNRULY to fill the gap it once filled. It turns out that these cases are considered "Lost positives", words where the positive root word has faded from usage while the negation of the word is still going strong. Here is a video from RobWords that gives a good overview. I have been enjoy...
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