Gourd vs Undefined - What's the difference?

As a noun gourd

is any of the trailing or climbing vines producing fruit with a hard rind or shell, from the genera lagenaria'' and ''cucurbita (in cucurbitaceae).

lacking a definition or value.

(wikipedia gourd)

(en noun)

Any of the trailing or climbing vines producing fruit with a hard rind or shell, from the genera Lagenaria'' and ''Cucurbita (in Cucurbitaceae).

A hard-shelled fruit from a plant in Lagenaria'' or ''Cucurbita .

The dried and hardened shell of such fruit, made into a drinking vessel, bowl, spoon, or other objects designed for use or decoration.

(obsolete) Any of the climbing or trailing plants from the family Cucurbitaceae, which includes watermelon, pumpkins, and cucumbers.

(informal) loaded dice.

(slang) Head.

I got so stoned last night. I was out of my gourd .

* gourdful

* American Gourd Society

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(wikipedia undefined) (-)

Lacking a definition or value.

(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.

The result of division by zero is undefined .

* defined