IPA: /ˈhɛmlɪtˌlaɪk/
KK: /ˈhɛlmɪtˌlaɪk/
Having a shape or appearance similar to a helmet.
The soldier wore a helmetlike cap for protection during the mission.
Helmetlike → It is formed from "helmet" (from Old English *helm*, meaning protective headgear) and "-like" (meaning resembling or similar to). The word "helmetlike" describes something that resembles or is similar to a helmet.
Think of something that is "similar to" a "helmet" — that's what helmetlike means.