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semicircular arch
semicircular arch /ˌsɛmiˈsɜːrkjʊlər ɑːrtʃ/
noun
-
A round arch drawn from a single center
(
Roman arch
, semicircular arch
)
a round arch drawn from a single center
chalybite
chalybite /ˈkælɪbaɪt/
noun
-
Iron ore in the form of ferrous carbonate
(
chalybite
, siderite
)
iron ore in the form of ferrous carbonate
launch pad
launch pad /ˈlɔːntʃ pæd/
noun
-
A platform from which rockets or space craft are launched
(
launch area
, launch pad
, launching pad
, launchpad
, pad
)
a platform from which rockets or space craft are launched
The spacecraft was positioned on the launch pad, ready for liftoff
The spacecraft was positioned on the launch pad, ready for liftoff
tire chain
tire chain /ˈtaɪər tʃeɪn/
noun
-
[ N. American]
Chain attached to wheels to increase traction on ice or snow
(
snow chain
, tire chain
[ N. American] , tyre chain
[British] )
chain attached to wheels to increase traction on ice or snow
