echelin Y

== Welsh == === Alternative forms === echelin y === Etymology === echelin (“axis”) + Y. === Noun === echelin Y f (mathematics) y-axis ==== Related terms ==== echelin X echelin Z === Further reading === Delyth Prys; J.P.M. Jones; Owain Davies; Gruffudd Prys (2006), Y Termiadur: termau wedi'u safoni; standardised terminology‎[1] (in Welsh), Cardiff: Awdurdod cymwysterau, cwricwlwm ac asesu Cymru (Qualifications curriculum & assessment authority for Wales), →ISBN