動(dòng)詞 circumscribe:

1. draw a line around
2. restrict or confine, "I limit you to two visits to the pub a day"
   同義詞：limit, confine
3. to draw a geometric figure around another figure so that the two are in contact but do not intersect

cir.cum.scribe

v.tr.（及物動(dòng)詞）
cir.cum.scribed,cir.cum.scrib.ing,cir.cum.scribes
To draw a line around; encircle.
劃一條線包圍；圍繞
To limit narrowly; restrict.
狹窄地限定；限制
To determine the limits of; define.See Synonyms at limit
確定…的范圍；下定義參見 limit

To enclose (a polygon or polyhedron) within a configuration of lines, curves, or surfaces so that every vertex of the enclosed object is incident on the enclosing configuration.
外接圓：用直線、曲線或面的結(jié)構(gòu)圍繞（多邊形或多面體），使被包圍物的每個(gè)頂點(diǎn)都內(nèi)接于該結(jié)構(gòu)
To erect (such a configuration) around a polygon or polyhedron:
使外接于…：確定（這樣一個(gè)結(jié)構(gòu)）圍繞一個(gè)多邊形或多面體：
例句：
circumscribe a circle around a square.
正方形的外接圓

來源：
Middle English circumscriben
中古英語 circumscriben
from Latin circumscrobere
源自 拉丁語 circumscrobere
circum- [circum-]
circum- [前綴，表.環(huán)繞.]
scrobere [to write] * see skrobh-
scrobere [寫] *參見 skrobh-

【引伸】
cir.cumscrib.able
adj.（形容詞）
cir.cumscrib.er
n.（名詞）