pycnogonid
noun
pyc·no·go·nid pik-ˈnä-gə-nəd 
ˌpik-nə-ˈgä-nəd
ˌpik-nə-ˈgä-nəd : sea spider
Example Sentences
Recent Examples on the Web Found in the Antarctic, this male pycnogonid spider (or a distant relative of a spider, anyway) bears its own eggs. 
Courtney Linder, Popular Mechanics, 17 Aug. 2022 Sea spiders, also known as pycnogonids, aren’t actual spiders. Ed Yong, The Atlantic, 10 July 2017
Courtney Linder, Popular Mechanics, 17 Aug. 2022 Sea spiders, also known as pycnogonids, aren’t actual spiders. Ed Yong, The Atlantic, 10 July 2017 Word History
Etymology
ultimately from Greek pyknos + gony knee — more at knee entry 1
First Known Use
1869, in the meaning defined above
- ton and chel
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- ton-in-ash
- ton-kilometer
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- tonal