from The Century Dictionary.
- noun Milit., an adaptation of the heliotrope to the purpose of transmitting military signals in the day-time by means of the number and the grouping of the flashes.
from the GNU version of the Collaborative International Dictionary of English.
- noun An instrument for signaling by reflecting the rays of the sun in different directions.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun dated An
instrumentfor signallingby reflectingthe rays of the sun in different directions.
from Wiktionary, Creative Commons Attribution/Share-Alike License
Ancient Greek sign + to turn.
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