RET 



357 



RHA 



into one another and form a net- 

 work : reticulum, n., re-tik'-ul' 

 um, the second stomach of the 

 ruminant animal, often called 

 the honey-comb bag, from the 

 numerous polygonal cells which 

 cover its surface ; in bot. , the 

 debris of cross-fibres about the 

 base of the petioles in. palms. 



retiform. a., ret'-i-ftirm (L. rete, a 

 net ; forma, shape), having the 

 structure of a net. 



retina, n., ret'm-a (L. rete, a net), 

 one of the coats of the eye, 

 resembling fine network, which 

 receives the impressions resulting 

 in the sense of vision : retinitis, 

 n., r&'m'it'is, inflammation of 

 the retina. 



retinaculum, n., retf-in-ak'-ul-um 

 (L. retinaculum, a holdfast, a 

 band), in bot., the viscid matter 

 by which the pollen -masses in 

 Orchids, etc., adhere to a pro- 

 longation of the anther : retin- 

 acula, n. plu., r^m-aJc-'Ul-d, in 

 anat., bands which hold the 

 tendons close to the bones of the 

 wrist, ankle, etc. ; the fold of 

 membrane continued from each 

 commissure of the ilio-csecal and 

 ilio- colic valves round on the 

 inner side of the caecum. 



retinervis, a., ret'-m-errf-is (L. 

 rete, a net ; nervus, a nerve), 

 in bot., having reticulated veins 

 or nerves ;< also called retivenius, 

 a., ret'4'Ven f 'i-us (L. vena, a 

 vein). 



retractor, a., r&traJct'-fo (L. re- 

 tractus, withdrawn from re, 

 back ; tractus, drawn), a name 

 for those muscles which, by their 

 contraction, withdraw the parts 

 to which they are attached. 



retrahens aurem, re,'-tra>h%nz 

 dwr'$m (L. retrahens, drawing 

 back ; auris, nom., the ear, au- 

 rem, obj., the ear), the smallest 

 of the three muscles placed 

 immediately beneath the skin 

 around the external ear ; see 

 'attollens aurem.' 



retro-peritoneal, a., ret'-rd-per'-fr 

 tdn-e'-al (L. retro, back; Eng. 

 peritoneal), a name for the layer 

 of tissue which forms the parietal 

 portion of the serous membrane 

 of the abdominal cavity, con- 

 nected loosely with the fascia 

 lining the abdomen and pelvis ; 

 also called * sub-peritoneal. ' 



retro-pharyngeal, a., ret'ro-far'* 

 in-j&al (L. retro, behind, back- 

 ward ; Eng. pharyngeal), pert, 

 to the parts behind the pharynx ; 

 denoting an abscess formed at 

 the back part of the pharynx. 



retrorse, a., re-tr firs' (L. retrorsum, 

 backwards from retro, back- 

 wards ; versus, turned), turned 

 or directed backwards. 



retuse, a., re-tus' (L. rZtusus, 

 blunted), in bot.^ having the 

 extremity broad, blunt, and 

 slightly depressed ; appearing as 

 if bitten off at the end. 



revohite, a., r%o'>6l-6t, also revol- 

 utive,. a., rVv'-til-dt-iv (L. revol- 

 utus, revolved from re, back ; 

 Volvo* I roll),- in bot., rolled 

 backwards from the margins 

 upon the under surface, usually 

 applied to the edges of leaves ; 

 having the edges rolled back 

 spirally in vernation. 



Rhabdophora, n. plu ly rab-dtif- 

 dr-a (Gr. rhabdos, a rod ; phoreo, 

 I bear), a name for the Grap- 

 tolites, because they commonly 

 chitinous rod or axis 



supporting the perisarc. 

 hacnitis, r ah -it -is, \ 



rhi 



but 



the former 



see 'rachitis/ 

 is the proper 



Rhamnaceae, n. plu., ram-nd'-sZ-e 

 (Gr. rhamnos, the white-thorn), 

 the Buckthorn family, an Order 

 of plants, many of which have 

 active cathartic properties : 

 Rhammis, n. y ram'-nus, a genus 

 of plants : Rhamnus catharticus, 

 kMh-drtf&'ti* (Gr. kathartikos, 

 purifying or cleansing), common 

 or purging Buckthorn, whose 

 black succulent berries are used 



