
1) Muscle 2) Musculus
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https://www.crosswordclues.com/clue/rectus

Latin, meaning: right, correct, proper, upright, natural, plain.
Found on
http://archives.nd.edu/rrr.htm

• (n.) A straight muscle; as, the recti of the eye.
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http://thinkexist.com/dictionary/meaning/rectus/

(rek´tәs) Latin word meaning straight; a term used in anatomy.
Found on
http://www.encyclo.co.uk/local/21001
Rec'tus noun ;
plural Recti (-t...). [ New Latin , from Latin
regere to keep straight.]
(Anat.) A straight muscle; as, the
recti of the eye.
Found on
http://www.encyclo.co.uk/webster/R/28

Rectus: Usually refers to the rectus abdominis, a large muscle in the front of the abdomen that assists in the regular breathing movement and supports the muscles of the spine while lifting and keeping abdominal organs such as the intestines in place. The rectus abdominis plays a key role in 'sit-ups.' Rectus means straight. The rectus abdominis is...
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http://www.medterms.com/script/main/art.asp?articlekey=7405

[
n] - any of various straight muscles
Found on
http://www.webdictionary.co.uk/definition.php?query=rectus
noun any of various straight muscles
Found on
https://www.encyclo.co.uk/local/20974

Latin rectus = straight.
Found on
https://www.encyclo.co.uk/local/21450

right, correct, proper, upright, natural, plain.
Found on
https://www.math.ubc.ca/~cass/frivs/latin/latin-dict-full.html
No exact match found.