haustra
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haustrum
[haws´trum] (pl. haus´tra) (L.)one of the pouches of the colon, produced by adaptation of its length to the taenia coli, or by collection of circular muscle fibers 1 or 2 cm apart; the haustra are responsible for the sacculated appearance of the colon. 

Haustrum. From Dorland's, 2000.
haus·tra
(haw'stră), Avoid the incorrect form haustrae.Plural of haustrum.
[L.]
haustrum
(haw′strŭm) plural.haustra [L. haurire, to draw, drink]One of the sacculations of the colon caused by longitudinal bands of smooth muscle (taeniae coli) that are shorter than the gut.
haustral (haw′străl), adjectivehaustra
plural of haustrum.