SEC- 



SEG- 



secondary meristem or cambium 

 producing new tissue on both sides, 

 as in woody dicotyledons (dot.). 



secondary meristem, phellogen 

 (dot.). 



secondary prothallium, a tissue 

 produced in the megaspore of 

 Selaginella after the true pro- 

 thallium is formed (dot.). 



secondary roots, branches of the 

 primary root, arising within its 

 tissue, and in turn giving rise to 

 tertiary roots ; roots arising at 

 other than normal points of origin 

 (dot.). 



secondary spore, a small or ab- 

 jointed spore ; an ascospore (dot.). 



secondary tissue, tissue formed 

 through phellogen, externally cork, 

 and internally phelloderm (dot.). 



secondary wood, wood formed from 

 cambium (dot.). 



secretin (sekre'tin) n. [L. secernere, 

 to separate.] A chemical substance 

 produced in the intestinal mucous 

 membrane whose action on the 

 pancreas causes a copious secretion 

 of pancreatic juice (phys.). 



secretion (sekre'shun) n. [L. secemere, 

 to separate.] A substance or fluid 

 which is separated from the blood 

 or other cells ; the process of such 

 separation (phys.). 



secretitious (sekretish'us) a. [L. 

 secernere, to separate.] Appl. a 

 substance or fluid secreted (phys.). 



secretory (sekre'tori) a. [L. secernere, 

 to separate.] Performing the office 

 of secretion (phys.). 



sectile (sgk'tll) a. [L. secare, to cut.] 

 Cut into small partitions, com- 

 partments (dot.). 



sectorial (sgkto'rial) a. [L. secure, 

 to cut.] Formed or adapted for 

 cutting, as certain teeth. 



secund (sgk'und) a. [L. secundus, 

 following.] Appl. flowers or leaves 

 arranged on one side of the stem 

 (dot.). 



secundiflorous (sfikund'Iflo'rus) a. [L. 

 secundus, following ; ftos, flower.] 

 Having flowers on one side of the 

 stem only (dot.). 



secundine (s6k'undin) n. [L. secundus, 

 following.] The second coat of 

 the ovule, lying within the primine 

 (dot.). 



secundines, the foetal membranes 

 collectively (anat.). 



secondly (sek'undlT) adv. [L. se- 

 cundus, following.] On one side 

 of a stem or axis (dot.). 



sedentary (sed'Sntari) a. [L. sedere, 

 to sit.] Not free-living ; appl. 

 animals attached by a base to 

 some substratum (zool.). 



seed (sed) n. [A.S. saed, seed.] A 

 mature fruit containing an embryo 

 ready for germination under suit- 

 able conditions (hot.) ; semen 

 (anat.). 



seed bud, an ovule (dot.). 



seed coat, the testa, a thin mem- 

 brane investing the seed (hot.). 



seed plant, a seed-bearing plant 

 (dot.). 



seed stalk, the funicle (hot.}. 



seed vessel, a structure containing 

 seed, as a pod (dot.). 



segment (seg'me'nt) n. [L. seg- 

 mentum, a piece cut off".] A divi- 

 sion formed by cleavage of an 

 ovum (emb.) ; a part of an animal 

 or of a jointed appendage (zool.) ; 

 a division of a leaf if cleft nearly to 

 the base (dot.). 



segmental (sggmgn'tal) a. [L. seg- 

 mentum, a part.] Of the nature 

 of a segment ; pert, a segment. 



segmental arteries, diverticula 

 from the dorsal aortae arising in 

 the spaces between successive 

 somites (emb.). 



segmental duct, an embryonic duct 

 which gives rise to Wolffian or 

 Miillerian duct (emb.). 



segmental organ, an embryonic 

 excretory organ (emb.). 



segmental papillae, conspicuous 

 pigment spots by which true seg- 

 ments maybe recognised in Leeches 

 (zool.). 



segmentation (s&g'mSnta'shun) n. 

 [L. segmentum, a segment.] The 

 division or splitting into segments 

 or portions (btol.) ; cleavage of an 

 ovum (emb.). 



segmentation cavity, the blastocoel 

 or central cavity formed at an early 

 stage of egg cleavage (emb.). 



segmentation nucleus, the body 

 formed by the union of male and 

 female pronuclei in the course of 

 fertilization of an ovum (emb.). 



