antenna

Antennae on a black fly.

Meaning

A feeler organ on the head of an insect, crab, or other animal.
An apparatus to receive or transmit electromagnetic waves and convert respectively to or from an electrical signal.
The faculty of intuitive astuteness.
A fragment of an oligosaccharide
The spar to which a lateen sail is attached, which is then hoisted up the mast.

From Latin antenna ("yard, sailyard; pole"). First used in this sense as a Latin word in the 15th century and as an English word by the end of the 17th century.

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