Englishfor English speakers
dot
Noun
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A dot is a small round mark.
You forgot to put a dot over the i.
The address is simple dot wiktionary dot org (simple.wiktionary.org).
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If you do something at a particular time "on the dot", you do it exactly at that time.
I'll be there at 5:00 on the dot.
dot
Verb
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If you dot something, you put small round marks on it.
Don't forget to dot the i.
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If an area is dotted with things, the things are spread out over the area.
The valley was dotted with camp fires.
lichen
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noun
any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc
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noun
any of several eruptive skin diseases characterized by hard thick lesions grouped together and resembling lichens growing on rocks