No, it does not sum up what it does. "Terminal" is from "terminalis" meaning an endpoint to connect to a computing device. (The terminal itself does not do significant or interesting computation.)
From French terminal, from Late Latin terminalis (“pertaining to a boundary or to the end, terminal, final”), from Latin terminus (“a bound, boundary, limit, end”); see term, terminus.
6. (computing) In the context of computer hardware, a device for entering data into a computer or a communications system and/or displaying data received, especially a device equipped with a keyboard and some sort of textual display.
7. (computing) A computer program that emulates a terminal (6).
Does it not emulate a terminal and therefore qualify for number 7? It seems that when you start up one of the snapshots, it provides a persistent terminal session, in the browser. And isn't the browser itself a terminal for controlling a remote computer?
From Wiktionary
https://en.wiktionary.org/wiki/terminal
Etymology
From French terminal, from Late Latin terminalis (“pertaining to a boundary or to the end, terminal, final”), from Latin terminus (“a bound, boundary, limit, end”); see term, terminus.
6. (computing) In the context of computer hardware, a device for entering data into a computer or a communications system and/or displaying data received, especially a device equipped with a keyboard and some sort of textual display.
7. (computing) A computer program that emulates a terminal (6).