caseless
Adjective
Meaning
Without a casing; uncased.
Without grammatical case.
Source: en.wiktionary.orgSynonyms
Antonyms
Examples
The combustible casings of the 152mm caseless ammunition rounds did not burn completely, requiring a complicated and slow gas-driven scavenging system.
While the M48's 90mm cannon fired fixed metallic cased rounds, the 152mm was caseless.