From the hypothetic εἴδω, a verb whose present tense is unknown, but is found only in εἶδον, the aorist principal part of ὁράω "I see", and οἶδα "I know". Ultimately from Proto-Indo-European *weyd- (“to see”).
εἶδος • (eîdos) (genitive εἴδεος or εἴδους); n, third declension;
- That which is seen: form, image, shape
- appearance, look
- fashion, sort, kind
- wares, goods
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||The irregular accentuation of this paradigm is explained by the fact that it is the contracted version of the above paradigm.