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What does Derrida mean by 'Logos'?

In 'Of Grammatology', Derrida writes:  
'from the pre-Socratics to Heidegger, (metaphysics has) always assigned the origin of truth in general to the logos'.  
Does this mean there is some 'underlying truth' (from which all other truths are derived) that he will go on to argue against? A cursory look into what 'logos' means gives me this impression, but I can't find a solid definition.
gpt
*Logos*, in Greek, means "speech," and is derived from the verb "to speak." It also can mean "account," especially a rational or scientific/philosophical account, and "ratio" in the mathematical sense of a proportion between numbers.

In this work and others, Derrida will emphasize the privileged place of *spoken discourse* over *written discourse*. Written discourse, he will argue, often gets placed in a subordinate place to spoken discourse. He especially identifies this theme in Plato.

[Edit: The idea is that when a person is speaking, they somehow have more control over the meaning of their words, insofar as their physical presence allows them to animate the meaning of their words with an "intention." Written discourse, by contrast, lacks this animating intention of the speaker. So by "metaphysics," Derrida means "the metaphysics of presence" (following Heidegger), an understanding of being/truth in terms of *physical presence* in the *temporal present*. "Logocentricism" (the privileging of speech over writing), for Derrida, is part of the metaphysics of presence insofar as philosophers have attempted to stabilize the meaning of their texts by appealing to the physical presence of a speaker, the animating intention of their thoughts when speaking, etc.]