RET- 



274 



RHA- 



retrocaecal (ret'rose'kal) a. [L. retro, 

 backwards ; caecus, blind.] Behind 

 the caecum ; appl. fossae additional 

 to the caecal fossa (anat.). 



retrofract (ret'rofrakt) a. [L. retro, 

 backwards ;fractus, broken.] Bent 

 backwards at an angle (bot.). 



retrogression (ret'rogre'sh'un) n. [L. 

 retro, backwards ; gradus, a step.] 

 A step from superior to inferior 

 type in the development of an 

 individual or race (biol.). 



retrogressive (ret'rogrfis'iv) a. [L. 

 retro, backwards ; gradus, a step.] 

 Degenerating; assuming character- 

 istics of a lower type (biol.). 



retrolingual (ret'roling'gwal) a. [L. 

 retro, backwards ; lingua, a tongue.] 

 Behind the tongue ; appl. a gland 

 (zool). 



retromorphosis (ret'rom6r'fosis) n. 

 [L. retro, backwards ; Gk. morphe, 

 form.] Development with a de- 

 generating tendency (biol.). 



retropharyngeal (ret'rofarin'jeal) a. 

 [L. retro, backwards ; Gk. pharyngx, 

 pharynx.] Behind the pharynx \ 

 appl. a space, lymph gknds (anai$~ 



retropubic (ret'ropu'bik) a. {L.'^etro, 

 backwards ; pubes, of ripe agte.], 

 Appl. a pad or mass of fatty tissue 

 behind the pubic symphysis (anat). 



retrorse (retrors') a. [L. retro, back- 

 wards ; vertere, to turn.] Turned 

 or directed backwards. 



retroserrate (ret'roser'at) a. [L. retro, 

 backwards ; serra, a saw.] Toothed, 

 with teeth directed backwards. 



retroserrulate (ret'roser'ulat) a. [L. 

 retro, backwards ; serra, a saw.] 

 With small retrorse teeth. 



retrouterine (ret'rou'tgrln) a. [L. 

 retro, backwards ; uterus, womb.] 

 Behind the uterus (anat). 



retroverse (ret'rovgrs') a. [L. retro, 

 backwards ; vertere, to turn.] Re- 

 trorse. 



retroversion (ret'rdveVshun) n. [L. 

 retro, backwards ; vertere, to turn.] 

 State of being reversed or turned 

 backwards. 



retuse (retus') a. [L. retusus, beaten 

 back.] Obtuse with a broad shallow 

 notch in the middle ; appl. leaves 

 (bot). 



revehent (reve'hent, rgv'ehgnt) a. [L. 

 revehens, carrying back.] In the 



renal portal system, appl. vessels 

 carrying blood back from the 

 excretory organs (zool.). 



reversed (reveVsd) a. [L. re, back ; 

 vertere, to turn.] Inverted (bot.) ; 

 appl. a spiral shell whose turns are 

 directed sinistrally (zool.). 



reversion (revfir'shun) n. [L. re, 

 back ; vertere, to turn.] Atavism ; 

 a return in a greater or less degree 

 to some ancestral type (biol.). 



reversionary (revgr'shonari) a. [L. 

 re, back ; vertere, to turn.] Appl. 

 atavistic characteristics (biol.). 



revert (revgrt') v. [L. re, back ; 

 vertere, to turn.] To exhibit an- 

 cestral features ; to hark back 

 (biol.}. 



revolute (rev'olut) a. [L. revolvere, to 

 roll back.] Rolled backwards from 

 the margin upon the under surface, 

 as some leaves (bot.). 



rhabdite (rab'dit) n. [Gk. rhabdos, a 

 rod.] One of the short rod-like 

 bodies in the epidermal cells in 

 Polycladida ; a gonapophysis (zool.}. 



rhabdocrepid (rab'dokrep'id) a. [Gk. 

 rhabdos, a rod ; krepis, a founda- 

 tion.] Appl. a desma with uniaxial 



crepis, in sponge spicules (zool.}. 



rhabdoid (rab'doid) a. and n. [Gk. 

 rhabdos, a rod ; eidos, resemblance.] 

 Rod-like ; any rod-shaped body. 



rhabdolith (rab'dolTth) n. [Gk. rhab- 

 dos, rod ; lithos, stone.] A cal- 

 careous rod found in some Protozoa, 

 strengthening the walls (zool.}. 



rhabdome (rab'dom) n. [Gk. rhabdos, 

 a rod.] A refractive rod composed 

 of rhabdomeres enclosed by the 

 retinula cells of an arthropod om- 

 matidium (zool.\ 



rhabdomere (rab'domer) n. [Gk. 

 rhabdos, a rod ; tneros, a part.] The 

 refracting element in the retinula 

 (zool.). 



rhabdopod (rab'dopod) n. [Gk. rhab- 

 dos, rod ; pous, foot.] An element 

 of the clasper of some male Insects 

 (zool.}. 



rhabdosphere (rab'dosfer) n. [Gk. 

 rhabdos, rod ; sphaira, a globe.] 

 Aggregated rhabdoliths found in 

 deep-sea calcareous oozes (zool.}. 



rhabdus (rab'dus) n. [Gk. rhabdos, 

 a rod.] A rod-like spicule (zool.}. 



rhachis, see rachis. 



