Word: upcall
Part of speech: Noun
Syllables: up
call
Definition: A call from a lower-level subsystem, such as a kernel or framework, to a higher-level subsystem, such as user code.
Morphemes:
Affix: up-
Language: en
PoS: Prefix
Meaning: Used to indicate higher position or direction, literally or figuratively.
Affix: call
Language: en
PoS: Noun
Meaning: A reference to, or statement of, an object, course, distance, or other matter of description in a survey or grant requiring or calling for a corresponding object, etc., on the land.