3. (Med.) Metastasis of an eruption or a tumor from the surface to the
interior of the body.
Re"tro*choir (?), n. [Pref. retro- + choir.] (Eccl. Arch.) Any
extension of a church behind the high altar, as a chapel; also, in an
apsidal church, all the space beyond the line of the back or eastern
face of the altar.
Re`tro*cop"u*lant (?), a. [See Retrocopulation.] Copulating backward,
or from behind.
Re`tro*cop`u*la"tion (?), n. [Pref. retro- + copulation.] Copulation
from behind. Sir T. Browne.
Re`tro*duc"tion (?), n. [L. retroducere, retroductum, to lead or bring
back; retro backward + ducere to lead.] A leading or bringing back.
{ Re"tro*flex (?), Re"tro*flexed (?), } a. [Pref. retro- + L. flectere,
flexum, to bend, to turn.] Reflexed; bent or turned abruptly backward.
Re`tro*flex"ion (?), n. The act of reflexing; the state of being
retroflexed. Cf. Retroversion.
{ Re"tro*fract (?), Re"tro*fract`ed, } a. [Pref. retro- + L. fractus,
p. p. of frangere to break.] (Bot.) Refracted; as, a retrofract stem.
Re`tro*gen"er*a*tive (?), a. [Pref. retro- + generative.] Begetting
young by retrocopulation.
Re`tro*gra*da"tion (?), n. [F. rétrogradation or L. retrogradatio. See
Retrograde.] 1. The act of retrograding, or moving backward.