Answer: module

AnswerCrossword Clue
MODULELunar lander, e.g.
MODULEUnit for measuring flowing water.
MODULELem, for one
MODULEMeasurement standard
MODULEComputer component
MODULELunar...
MODULENASA component
MODULEInterchangeable unit
MODULEComputer program subsection
MODULEInterchangeable part
MODULEPart of a spaceship
MODULESpacecraft component
MODULEComponent
MODULESpace station section
modulea standard of measurement
modulebuilding unit
moduleself-contained segment of a spacecraft
MODULELunar lander
MODULEStructural component
MODULESeparable component
MODULEFurniture piece
MODULECurriculum component
MODULESelf-contained spacecraft section
MODULEThe "M" in LEM
MODULEPart of LEM
MODULELunar ...
MODULESpacecraft segment
MODULESelf-contained unit
MODULESpacecraft section
MODULEThe "M" of LEM
MODULECurriculum unit
MODULEStandard unit
MODULERocket tier?