| frontonasal suture | Line of union of the frontal and of the two nasal bones. Synonym: sutura frontonasalis, sutura nasofrontalis. (05 Mar 2000) |
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| frontozygomatic suture | Line of union between the zygomatic process of the frontal and the frontal process of the zygomatic bone. Synonym: sutura frontozygomatica, sutura zygomaticofrontalis. (05 Mar 2000) |
| Frost suture | Intermarginal suture between the eyelids to protect the cornea. (05 Mar 2000) |
| Lembert suture | The second row of the Czerny-Lembert intestinal suture; an inverting suture for intestinal surgery, used either as a continuous suture or interrupted suture, producing serosal apposition and including the collagenous submucosal layer but not entering the lumen of the intestine. (05 Mar 2000) |