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OMM- 



oestrual (e'strooal) a. [Gk. oistros, 

 gadfly.] Pert, oestrus (phys.} ; also 

 oestrous. 



oestruatlon (e'strooa'shun) n. [Gk. 

 oistros, gadfly.] State of being 

 under sexual desire ; rut (phys.}. 



oestrus (e'strus) n. [Gk. oistros, gad- 

 fly.] The sexual heat of animals ; 

 rut (phys.}. 



offset, a short prostratebranch which 

 takes root at the apex and develops 

 new individuals (hot.}. 



offshoot, a lateral shoot from a main 

 stem (hot.). 



oidium (oid'ium) n. [Gk. oon, an 

 egg.] The conidial stage of some 

 of the mildews (bot.}. 



oikoplast (oik'oplast) n. [Gk. oikos, 

 house ; plastos, moulded?) One of 

 the large glandular ectoderm cells 

 which form the gelatinous layer of 

 Appendicularians (zool.}. 



oilgland, the uropygial gland in 

 Birds ; a gland which secretes oil 

 (zool.}. 



oleaginous (61'eaj'inus) a. [L. olea, 

 oil.] Pert, oil ; containing oil ; 

 producing oil (biol.}. 



olecranon (olgk'ranon) n. [Gk. olene, 

 elbow.] A large process at the 

 upper end of the ulna (zool.}. 



oleiferous (oleif'Srus) a. [L. oleum, 

 oil ; fern, to carry.] Producing oil 

 (bot.}. 



oleln (6'lem) n. [L. oleum, oil.] A 

 fat found in animal and vegetable 

 tissues and liquid at ordinary tem- 

 peratures (phys.}. 



oleocyst (6'leosist) n. [L. oleum, oil ; 

 Gk. kystis, bladder.] A diverticu- 

 lum of the nectocalyx (zool.}. 



olfactory (61fak'torT) a. [L. olere, to 

 have a smell ; facere, to make.] 

 Pert, associated with, or designating 

 the structures associated with the 

 sense of smell. 



olfactory lobe, a small lobe project- 

 ing from the anterior lower margin 

 of the cerebral hemispheres (anat.}. 



olfactory pit, any olfactory organ 

 of the nature of a small pit or 

 hollow (zool.} ; the depression which 

 later forms the nasal passage (eml>.). 



oligacanthous (61'Igakan'thus) a. [Gk. 

 oligos, few ; akantha, a spine.] 

 Bearing few spines (zool.}. 



oligandrous (ol'igan'drus) a. [Gk. 



oligos, few ; aner, man.] Having 

 few stamens (hot.}. 



oligocarpous (ol'igokar'pus) a. [Gk. 

 oligos, few ; karpos, fruit.] Having 

 few carpels (hot.}. 



Oligocene (61'igosen') a. [Gk. oligos, 

 few ; kainos, recent.] Appl. a terti- 

 ary period between Eocene and 

 Miocene (pal.}. 



ollgodynamic (ol'igodinam'ik) a. 

 [Gk. oligos, few ; dynamis, power.] 

 Caused by small or minute forces 

 (bot.}. 



oligomerous (ol'igom'erus) a. [Gk. 

 oligos, few ; meros, a part.] Hav- 

 ing one or more of the whorls with 

 fewer members than the rest (bot.}. 



oligonephrous (ol'igonef'rus) a. [Gk. 

 oligos, few ; nephros, a kidney.] 

 Having few Malpighian tubules ; 

 appl. Insects (zool.}. 



oligospermous (ol'Igosper'mus) a. 

 [Gk. oligos, few ; sperma, a seed.] 

 Bearing few seeds (bot.}. 



oligostemonous (ol'Igostern'onus) a. 

 [Gk. oligos, few ; stemon, a stamen.] 

 Having few stamens (bot.}. 



oligotaxy (61'igotak'si) n. [Gk. oligos, 

 few ; taxis, arrangement.] Diminu- 

 tion in the number of whorls (bot.}. 



oligotokous (ol'fgot'okus) a. [Gk. 

 oligos* few ; tokos, offspring.] Bear- 

 ing few young (zool.}. 



oliva (oli'va), olive (61'iv) n. [L. 

 oliva, olive.] A prominence on 

 each side of the anterior end of the 

 medulla just below the pons (anat}. 



olivary (61'ivari) a. [L. oliva, olive.] 

 Pert, the oliva, or olivary body 

 (anat}. 



omasum (oma'sum) n. [L. omasum, 

 paunch.] The psalterium or third 

 division of a ruminant's stomach 

 . (zool.}. 



omental (6'mSn'tal) a. [L. omentum, 

 a fold.] Pert, the omentum or 

 omenta (anat.}. 



omentum (om&n'tum) n. [L. omentum, 

 a fold.] A fold of the peritoneum 

 either free or acting as the con- 

 necting link between viscera, etc. 

 (anat.}. 



ommateum (om'ate'um) n. [Gk. 

 omma, the eye.] Any compound 

 eye (zool.}. 



ommatidium (om'atid'ium) n. [Gk. 

 omma, eye.] One of the com- 



