service module

American  

noun

1. (often initial capital letters) the section of an Apollo spacecraft containing the principal propulsion system, electrical system, water, and other supplies.

---

service module British  

noun

1. a section of an Apollo spacecraft housing the rocket engine, radar, fuel cells, etc, and jettisoned on re-entry into the earth's atmosphere See also lunar module command module

---

Etymology

Origin of service module

First recorded in 1960–65