A flood wall often made of rock and earth. It is chiefly British, spelled Dike. It may also be a ditch or channel. In Geology, it is a long mass of igneous rock that cuts across the structure of adjacent rock. The use of a dyke may cause severe flooding on the other side of the river and up-stream of the dyke.

This is also the original meaning of the word, in comparison to the new, generally accepted meaning referring to lesbians.
Because of the dyke across town, the flood was significantly less devistating.

Though it's a risk, there is a small hole in the dyke to let water seep out through more quickly.
by Ben Deivert May 31, 2008
A girl who has a dyke spike, holds her beerbelly in pictures, and looks like a total dude. Once was very cute, now looks like the true definition of dyke. Which is this.
Ew dude Sophie's such a dykeeee. She's so fucking dramatic and is turning into a butch bitch.
by LMFAOXDD January 20, 2010
a girl who is not very girly

acts like a man

gretchen duff
wow, that softball player is such a dyke!
by cHolmes May 20, 2008
A river dam, popular in the Netherlands.
The young man stuck his finger in the hole of the dyke, as it was leaking.
by eSouth March 19, 2005
Differentiate between DYKE and DIKE:

n. 1 dike: 7. a. A ridge, embankment, long mound, or dam, thrown up to resist the encroachments of the sea, or to prevent low-lying lands from being flooded by seas, rivers, or streams. (Oxford English Dictionary)
and
n. 2 dyke. Of obscure origin. A lesbian; a masculine woman. Also attrib.
1942 BERREY & VAN DEN BARK Amer. Thes. Slang §405/3 Masculine woman,..dike, dyke.

The spelling DIKE is the proper etymological spelling for the ditch. The spelling DYKE is useful to make the difference clear.
Why do lesbians wear Dutch Boy hairdos? 'Cuz we alway have our fingers in a dyke.
by Anne Thrax August 22, 2006
a lesbian(usually derogatory)
She was very offended when her best friend's father called her a dyke.
by Light Joker September 18, 2004
A lesbian, espically a butch, or masculine lesbian. Can be negative.
She's a totaly dyke.
by Mariel July 21, 2002
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