A word used to refer to Lesbians. Originally meant to be a slur, it has been "reclaimed" by many Lesbians who might use it to identify themselves of other Lesbians. It is considered rude to use the word "Dyke" unless you self-identify as one.
A type of water-stopping dam.
The dyke has a leak, the river will burst through!
2.- A person who is not heterosexual. The word was meant as an insult but has been reclaimed by many non-heterosexual folks, many of whom use it to describe one another. It is still often considered rude to use the word "queer" in this context unless you self-identify as "queer".
That's a queer colour, Bob. What did you do, mix pink, purple and yellow?