Word Unit: past- ()
Word Unit: patent- (Latin: to be open, lying open, to lie open)
Word Unit: pater-, patri-, patro-, patr-, -patria (Latin: father, dad, pop (family member); fatherland, country, nation)
Word Unit: path-, patho-, -path-, -pathia, -pathic, -pathology, -pathetic, -pathize, -pathy (Greek: feeling, sensation, perception; suffering, disease, or disorder; a system of treating diseases)

Related-word units meaning feeling: aesth-; senso-; pass-.

Word Unit: pauci-, paup- (Latin: few, little; insufficient)
Word Unit: pecca-, pecc- (Latin: to err, to sin, to commit a crime)

Related "sin, sinful" word unit: harmarto-.

Word Unit: pectoro-, pector- + (Latin: breast, chest)

Cross references of word families that are related, partially or totally, to: "breast, breasts, chest": mammill-; mammo-; masto-; mastoido-; mazo-; pleuro-; sterno-; stetho-; thorac-.

Word Unit: pecu-, pecun- (Latin: cattle, property in cattle; private property; money; particular)

Cross references of word families related to: "individual, personal": idio-; privat-, priv-.

Word Unit: ped-, pedi-, -pedal, -ped, -pede, -pedia (Latin: foot, feet; people often see this ped element in other words. When people refer to "pedal extremities", they mean "feet". When anyone pushes the pedals of a bicycle, it is done with the feet. A pedestrian must use the feet for walking. A quadruped has four feet while a centipede has "100 feet"; or a large number of them because it may be impossible to count all of them.)

Related "foot, feet" units: melo-; planta-; podo-; -pus.

Word Unit: pediculo-, pedicul-, pedico-, pedic- (Latin: louse, lousy; of lice)
Word Unit: pedo-, paedo-, ped-, paed-, paido-, paid- (Greek: child, boy; infant)
Word Unit: pedo-, ped- + (Greek: pedon, ground, soil, earth)

Cross references of word families related directly, or indirectly, to: "land, ground, fields, soil, dirt, mud, clay, earth (world)": agra-; agrest-; agri-; agro-; argill-; choro-; chthon-; epeiro-; geo-; glob-; lut-; myso-; pel-; rhyp-; soil-; sord-; terr-.

Word Unit: peer, pair (Latin: same, equal, similar)

Inter-related cross references, directly or indirectly, involving word units dealing with "equal, identical, same, similar": auto-; emul-; equ-, equi-; homeo-; homo-; iso-; pari-; rhomb-; syn-; tauto-.

Word Unit: pego-, -pegic (Greek: spring, fountain, mineral spring)
Word Unit: pejor- (Latin: worse; diminish, weaken; inferior in quality or condition)
Word Unit: pel-, -pell, -pellent, -peal (Latin: push, beat, strike, knock, drive)

Cross references of word families that are related directly, or indirectly, to: "push, shove, thrust": osmo-; puls-; trud-.

Word Unit: pel-, pelo- + (Greek: mud, earth, clay)

Cross references of word families related directly, or indirectly, to: "land, ground, fields, soil, dirt, mud, clay, earth (world)": agra-; agrest-; agri-; agro-; argill-; choro-; chthon-; epeiro-; geo-; glob-; lut-; myso-; pedo-; rhyp-; soil-; sord-; terr-.

Word Unit: pelago-, pelag- (Greek [pelagos] > Latin [pelagicus]: sea, pertaining to the sea or ocean)

Inter-related cross references, directly or indirectly, involving the "sea" and the "ocean" bodies of water: abysso- (bottomless); Atlantic; batho-, bathy- (depth); bentho- (deep, depth); halio-, halo- (salt or "the sea"); mare, mari- (sea); necto-, nekto- (swimming); oceano-; plankto- (drifting); thalasso- (sea, ocean).

Word Unit: pelt-, pelto-, pelti- + (Greek: shield; small-light shield)
Word Unit: pelvi-, pelvio-, pelvo-, pelyco- + (Latin: basin; basin-shaped structure of the body)