Often heared in embryology courses: “Ontongeny recapitulates Phylogeny”.

From a review of an S.J. Gould book:
“The idea that the development of individuals is a progression through adult ancestral forms, epitomised in the saying "ontogeny recapitulates phylogeny", has played an important part in the history of biology. “
At one stage the human embryo has structures resembling gills. Are you listening, WW”

ontogeny
n.
5prec. + 3GENY6 the life cycle of a single organism; biological development of the individual: distinguished from PHYLOGENY: also on[to[gen[e[sis 79n#tb jen4! sis8
on#to[ge[net4ic 73j! net4ik8 or on#to[gen$ic
adj.

phylogeny
n.,
pl. 3nies 5Ger phylogenie, coined (1866) by HAECKEL: see prec. & 3GENY6
1 the lines of descent or evolutionary development of any plant or animal species
2 the origin and evolution of a division, group, or race of animals or plants: distinguished from ONTOGENY
3 the historical development of a nonliving thing, as a group of languages Also phy[lo[gen[e[sis 7fj#lb jen4! sis8
phy#lo[ge[net4ic 73lb j! net4ik8 or phy#lo[gen$ic 73jen4ik8
adj.
phy#lo[ge[net$i[cal[ly
adv.

physiolatry
n. nature worship. physiolater, n. physiolatrous, a.

phytocidal - capable of killing plants

phytopathogen - an agent capable of causing disease in plants

picacho -- Found in many place names. Online Spanish dictionary found no match.

pierian
“A little Learning is a dang'rous Thing;
Drink deep, or taste not the Pierian Spring.”
Alexander Pope

piezo3
5< Gr piezein, to press < IE *pised3, to sit on, press < base *epi3, on + *sed3, SIT6 combining form pressure !piezom

pileiform - shaped like an umbrella

Pilpulist - one who engages in pilpul:
A method of Talmudic study. The word is derived from the verb "pilpel" (lit. "to spice," "to season," and in a metaphorical sense, "to dispute violently

pinaceous
adj.
5PIN(E) 1 + 3ACEOUS6 of the pine family of trees

pinacotheca - a picture gallery

pince-nez pronounced “pance nay”
n.
5Fr < pincer, to pinch + nez, nose6 pl. pince#-nez$ 73naz$; 3na$8 eyeglasses without temples, kept in place by a spring gripping the bridge of the nose

pineal body
a small, grayish, cone-shaped, glandular outgrowth from the brain of all vertebrates that produces the hormone melatonin: in lower vertebrates, often visible as an external median eye

Pinking
<XPAGE=1088Pink"ing, n.
1. The act of piercing or stabbing.
2. The act or method of decorating fabrics or garments with a pinking iron; also, the style of decoration; scallops made with a pinking iron. Pinking iron. (a) An instrument for scalloping the edges of ribbons, flounces, etc. (b) A sword. [Colloq.]

Pinnate, Pinnated
<XPAGE=1088Pin"nate (?), Pin"na*ted (?), a. [L. pinnatus feathered, fr. pinna a feather. See Pin a peg, Pen feather.]
1. (Bot.) Consisting of several leaflets, or separate portions, arranged on each side of a common petiole, as the leaves of a rosebush, a hickory, or an ash. See Abruptly pinnate, and Illust., under Abruptly.
2. (Zoöl.) Having a winglike tuft of long feathers on each side of the neck. Pinnated grouse (Zoöl.), the prairie chicken.
pin[to 7pin4tb8
adj.
5AmSp, spotted < obs. Sp < VL *pinctus: see PINTADO6 marked with patches of white and black or another dark color; piebald or skewbald
n.,

pinto
adj.
5AmSp, spotted < obs. Sp < VL *pinctus: see PINTADO6 marked with patches of white and black or another dark color; piebald or skewbald
n.,

Piolet
third generation peer-to-peer file sharing client for downloading MP3 music files.

pipkin
n.
5? dim. of PIPE, n. 116
1 a small earthenware pot
2 dial. var. of PIGGIN

I've heard of pinking shears (in fact, my mother has a pair), never a pinking iron.

Bingley

I'll bet of troy knows more about this pinking iron business. I, too, have heard of and seen pinking shears. My grandmother, a seamstress, used them sometimes to keep fabric she was going to sew from raveling at the edges.

But this pinking iron above that makes scallops? How interesting. I hope of troy can tell us more about it.

Wonder how pink relates to stab? wwh has unraveled the mystery about the pinky and five, so there's obviously no connection there... Faldage? wwh? You have a take there? of troy, too? Do you know the connection between pink and stab?

Tangent: I read about thirty years ago about a study on the effects of color on people's emotions, and pink was very, very bad for people who tended toward depression. Pink rooms worsened their emotional problems. 'Course we all know that you can get a study to show just about anything you want it to show--and all studies should be held in suspicion... Take the space shuttle Columbia, for instance. Preliminary flight safety studies showed go, go, go! But they hadn't run the right studies.

pinking irons were very popular in the beginning of the industrial revolution.. as new techniquies evolved for casting iron, there were a many

they constisted of 2 blocks of iron (6 to 10 inches long, 4 to 6 inches wide)a base and a top (sometimes hinged, sometimes seperate) the 'sandwich layer', was corrigated. and the fabric was layed in there. the top layer was lowered and fabric was ironed into ruffles or pinks.

Think of a 'waffle iron' (only the design was different.)

the Blocks were heated on a stove (an other early industrial revolution device!). you can sometimes see pinking irons in restoration villages. Shelburne Museum (VT) village has a collection.

And then there's prinking - needed to check what it was and found this gem:

"And on the subject of theater dress it might be tentatively remarked that prinking and “making up” in public are all part of an age which can not see fun in a farce without bedroom scenes and actors in pajamas, and actresses running about in negligés with their hair down. An audience which night after night watches people dressing and undressing probably gets into an unconscious habit of dressing or prinking itself. In other days it was always thought that so much as to adjust a hat-pin or glance in a glass was lack of breeding. Every well brought up young woman was taught that she must finish dressing in her bedchamber. But to-day young women in theaters, restaurants, and other public places, are continually studying their reflection in little mirrors and patting their hair and powdering their noses and fixing this or adjusting that in a way that in Mrs. Oldname’s girlhood would have absolutely barred them from good society; nor can Mrs. Worldly or Mrs. Oldname be imagined “preening” and “prinking” anywhere. They dress as carefully and as beautifully as possible, but when they turn away from the mirrors in their dressing rooms they never look in a glass or “take note of their appearance” until they dress again. And it must be granted that Lucy Gilding, Constance Style, Celia Lovejoy, Mary Smartlington and the other well-bred members of the younger set do not put finishing touches on their faces in public—as yet!"

>prinking

I've always heard "primping"...?

It's not only females who preen in public. I remember something written by George Washington, advising young men that the should not "discover their private parts" in public. Meaning no checking effectiveness of jockey shorts.

should not discover their private parts

I hope that dis- is being used in the negating sense and not the intensive sense.

No caressing the codpiece.

Someone should tell the NFL.