helmet

詳細解釋：

hel.met

n.（名詞）

A head covering of hard material, such as leather, metal, or plastic, worn by football players, firefighters, construction workers, motorcyclists, and others to protect the head.
頭盔：由堅硬材料如皮革、金屬或塑膠製成的頭部覆蓋物，由橄欖球隊員、消防隊員、建築工人、機車騎手或其他人配戴，用以保護頭部
The headgear with a glass mask worn by deep-sea divers.
（潛水）頭盔：由深水潛水員戴的帶有玻璃面罩的帽盔
A pith helmet; a topi.
遮陽帽：乾木髓做的太陽帽；軟木帽
A head covering, such as a balaclava, that is shaped like a helmet.
帽盔：一種形狀象頭盔的頭部覆蓋物，如巴拉克拉瓦盔式帽
A piece of armor, usually made of metal, designed to protect the head.
盔甲：一件盔甲，通常由金屬製成，設計用於保護頭部
Botany The hood-shaped sepal or corolla of some flowers.
【植物學】 盔狀花冠（或花萼）：某些花朵盔狀的花萼或花冠
v.tr.intr.（及物動詞和不及物動詞）
hel.met.ed,hel.met.ing,hel.mets
To provide with or put on a helmet.
給…提供（或配戴）頭盔

來源：
Middle English
中古英文
from Old French [diminutive of] helme
源自 古法文 [] helme的小後綴
[of Germanic origin] * see kel-
[日爾曼語源的] *參見 kel-

【引伸】
hel.meted
adj.（形容詞）