selkäkilpi — meaning in English

English meaning

carapace noun A tough shell made of bone or chitin that covers an animal's back for protection.
gladius noun A short sword used by Roman soldiers, about two feet long.
pen noun A handheld tool used for writing or drawing with ink.
quill noun The hollow central shaft of a bird's feather.

selkäkilpi is used for these senses in English:

carapace A hard protective covering of bone or chitin, especially one which covers the dorsal portion of an animal.
gladius (zoology) A pen, a hard internal bodypart of certain cephalopods, made of chitin-like material.
pen (zoology) The internal cartilage skeleton of a squid, shaped like a pen.
quill (zoology) The pen of a squid.
quill Something having the form of a quill, such as the fold or plain of a ruff, or (weaving) a spindle, or spool, upon which the thread for the woof is wound in a shuttle.

noun A tough shell made of bone or chitin that covers an animal's back for protection.
noun Anything that shields or guards something.

noun A short sword used by Roman soldiers, about two feet long.
noun A pen: a hard internal structure in certain cephalopods, made from a chitin-like substance.