endmember
end·mem·ber
endmember · endmembers
A member at one end of a range or series made up of similar membersA member at one end of a range or series made up of similar members.
UK/ˈɛndmɛmbə/US/ˈɛndmɛmbɚ/
Meaning
2 sensesA member at one end of a range or series made up of similar members.
(specifically)A mineral that occurs at one end in a range of solid solutions.
Origin
From end + member.From end + member.
Wiktionary, CC BY-SA 4.0 · source