Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
attĕgĭa, ae, f. [acc. to some, an Arab. word; acc. to others, as if from attego, ĕre, to cover; so Van.], a tent: Maurorum attegiae, Juv. 14, 196; Inscr. Orell. 1396.