masturbor

Etymology
. Traditionally suggested to be a compound of +, or a deformed compound of  + , from , with influence from. In that case the vowel a would be expected to be long and nasalized, via /mans.t-/, as in. Some suggest the first part to be an unattested meaning of as “penis” (see de Vaan).

Watkins has traced the root to a, extended and metathesised from , also found in 🇨🇬 and 🇨🇬. The semantic relationship is due to the widely attested belief that semen descends from the brain through the bones and is the same substance as brain matter and bone marrow; compare “the symbolic autofellatio of 's gnawing his thumb to the marrow” and the obsolete meaning of.

Verb

 * 1) to masturbate