From the American Heritage Dictionary

structure n.

1. Something made up of a number of parts that are held or put together in a particular way: hierarchical social structure.
2. The way in which parts are arranged or put together to form a whole; makeup: triangular in structure.
3. The interrelation or arrangement of parts in a complex entity: political structure; plot structure.
4. Something constructed. See Synonyms at building.
5. Biology. a. The arrangement or formation of the tissues, organs, or other parts of an organism. b. An organ or other part of an organism.

-structure tr.v. structured, structuring, structures.

To give form or arrangement to: structure a curriculum; structure one's day. [Middle English, the process of building, from Latin structura, from structus, past participle of struere, to construct. See ster-2 below.]

ster-2. Important derivatives are: structure, construct, destroy, instruct, obstruct, industry, strew, straw, street, stratagem.
ster-2. Also sterõ-. To spread.

I. Extended form *streu-.
1. STRAIN2, from Old English strTon, something gained, offspring, from Germanic suffixed form *streu-nam.
2. STRUCTURE; CONSTRUCT, DESTROY, INSTRUCT, OBSTRUCT, SUBSTRUCTION, from Latin struere, to pile up, construct.
3. Zero-grade form *stru-. INDUSTRY, from Latin industrius, diligent, from Old Latin indostruus (endo-, within; see en).
4. BREMSSTRAHLUNG, from Old High German strEla, arrow, lightning bolt, from Germanic *strTlÅ.

II. O-grade extended form *strou-.

1. Suffixed form *strou-eyo-. a. STREW, from Old English strT(o)wian, to strew; b. STREUSEL, from Old High German strouwen, strowwen, to sprinkle, strew. Both a and b from Germanic *strawjan.
2. Suffixed form *strow-o. STRAW, from Old English strTaw, straw, from Germanic *strawam, "that which is scattered."

III. O-grade extended form *stroi-. PERESTROIKA, from Old Russian stroj≤, order.

IV. Basic forms *ster-, *sterõ-.

1. Nasalized form *ster-n-õ-. STRATUS, STREET; CONSTERNATE, PROSTRATE, SUBSTRATUM, from Latin sternere (past participle strEtus from zero-grade *strõ-to-), to stretch, extend.
2. Suffixed form *ster-no-. STERNUM, from Greek sternon, breast, breastbone.

V. Zero-grade form *stä-, *stäõ-.

1. Suffixed form *stä-to-. STRATAGEM; STRATOCRACY, from Greek stratos, multitude, army, expedition.
2. Suffixed form *stäõ-to-. STRATH, from Old Irish srath, a wide river valley, from Celtic *s(t)rato-.
3. Suffixed extended form *stäõ-mx. STROMA; (STROMATOLITE), from Greek strÅma, mattress, bed. [Pokorny 5. ster- 1029.]