Ad signifies to, and for euphony takes the forms of ac, af, ag, al, an, ap, ar, and as; as ad and verto, advert, to turn to.

ad duce’     al lure’    as sail’     ag’gre gate
ac count’    an nex’     ad vance’    ag’gra vate
ac cord’     ar rive’    ad’verb      ap pend’age
af fix’      as cend’    ad’verse     ar’ro gance

Bi (from Latin bis, twice) means two, double, or in two.

bi’fid      bi den’tate     bi no’mi al
bi’form     bi cor’nous     bi en’ni al
bi’nate     bi fur’cate     bi noc’ular
bi’ped      bi lin’gual     bi valv’u lar
bi sect’    bi par’tite     bi sul’phu ret

Lesson 165.

Con (Latin cum, with) signifies with or together; it takes the forms of com, col, co, cog, and cor, for ease in pronunciation.

con vert’     con de scend’     con ven’tion al
com press’    com pan’ion       com pen sa’tion
col lect’     col’lo quy        col lat’er al
co here’      co-ex ist’        co-ex ten’sive
cog’nate      cog’ni zant       cog nos’ci ble
cor rect’     cor re spond’     cor o na’tion
con cur’      con vul’sion      con sec’u tive
con dign’     con vey’er        con se quen’tial
con form’     con tu’sion       con nat’u ral

Lesson 166.

De signifies down or from; epi significs on, near, during; and ex has the meaning out of.  Ex also becomes e, ec, or ef.

de scend’    ex tract’    ep i dem’ic
de tract’    e vade’      ep’i lep sy
de note’     ef fuse’     ep i glot’tis
de vote’     ec’logue     ep i derm’is

Dia, ob, per, and circum mean respectively apart, against, through, and around.  With English words, dis gives a negative meaning.

dis tend’    dis sev’er        dis em bar’rass
ob trude’    ob lique’ly       ob lit’er ate
per plex’    per fect’ive      per sist’en cy
cir’cuit     cir cum volve’    cir cum ja’cent

Lesson 167.

Mal signifies evil, ill; mono is from Greek monos, single; pan (Greek), signifies all, every thing; and poly (Greek polus), many.

mal’con tent    ma li’cious    ma lev’o lent
mon’o tone      mon’o gram     mo nop’o Iy
pan’o ply       pan’the ist    pan o ra’ma
pol’y gon       pol’y pus      pol’y the ism

Pro is a Latin preposition signifying for, before, and forth; uni (Latin unus, one) signifies one or producing one; syn (sometimes syl and sym) signifies together; and sub (sometimes suf, sup, and sug) denotes under, below.

pro’noun     u’ni ty        syn’the sis    sub scribe’
pro pel’     u’ni form      syl’la ble     suf’fix
pro duce’    u’ni corn      sym’pa thy     sup press’
pro vide’    u’ni val ve    syn tac’tic    sug gest’

Lesson 168.

Compound Words promiscuously arranged.

ale’-house      lime’-kiln     hedge’hog
hail’stone      boat’man       pen’knife
lay’man         four’score     grist’-mill
safe’guard      load’stone     mid’night
waist’coat      oat’meal       pitch’fork
bee’-hive       pole’-star     ship’wreck
key’-stone      snow’-drop     wrist’band
knee’-pan       sports’man     block’head
bride’groom     jew’s’-harp    cross’-bow
light’-house    luke’warm      off’spring

Lesson 169.