"ramjet." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/ramjet>.
ramjet. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/ramjet
(aviation) A jet engine in which forward motion forces air into an inlet, compressing it (as opposed to having a pump type device compressing the air for combustion with fuel), and where combustion is subsonic.
English Wiktionary. Available under CC-BY-SA license.