deca
deca — 字首
1. added to the front of a word to show that something involves the number ten, esp
十
用於名詞前表示「十」
added to the front of a word to show that something involves the number ten, especially in the names of geometric shapes and figures
Salma drew a decagon, a flat shape with ten straight sides.
Salma 畫了一個十邊形，一個有十條直邊的平面圖形。
deca- + -gon = ten-sided shape
The museum displayed a decahedron, a solid figure with ten faces.
博物館展示了一個十面體，一個有十個面的立體圖形。
Mei counted the ten sides on the decagon shape that her teacher drew on the classroom whiteboard.
Mei 數了老師在教室白板上畫的那個十邊形的十條邊。
During the exam, Osei identified the decagon by counting its ten sides.
考試時，Osei 數了十邊形的十條邊，從而認出了這個圖形。
文法句型
deca- + noun
deca- + adjective
用法筆記
Frequently attached to nouns formed from Greek roots, especially in geometry. The shorter form 'dec-' appears before vowels (e.g., 'decagon' alongside 'decahedron').
常見錯誤
2. used before a unit of measurement in the metric system to mean ten times that un
十倍
公制中十倍的單位前綴
used before a unit of measurement in the metric system to mean ten times that unit
A decaliter holds exactly ten liters of drinking water.
一個公斗正好可裝十公升的飲用水。
deca- + liter = unit of ten liters
Mathieu measured the field and found it was 0.3 decameters wide.
Mathieu 測量了田地的寬度，發現是 0.3 公丈。
The recipe called for one decagram of salt for the dough.
食譜要求加入一公錢的鹽來揉麵團。
In science class, Bilal checked the decameter markings on the running track.
自然課上，Bilal 查看操場跑道上的公丈標記。
- deci-
means one tenth, the inverse of deca-
文法句型
deca- + unit of measurement
deca- + meter/liter/gram
用法筆記
Only combines with standard metric base units (meter, liter, gram). Much less common in daily life than 'kilo-' (thousand) or 'centi-' (hundredth); the words 'decameter', 'decaliter', and 'decagram' appear mostly in textbooks and scientific contexts.
常見錯誤
deca — 構詞成分
1. a word element that joins to the front of a technical term to describe something
十部
由十個部分組成的構詞成分
a word element that joins to the front of a technical term to describe something whose internal structure consists of ten parts, members, or components — for example, a decapod is a creature with ten legs, and a decasyllabic line of verse has ten syllables
A decasyllabic line in a poem contains exactly ten syllables.
一行十音節詩句正好包含了十個音節。
combining form + technical adjective (-syllabic)
In biology class, Yuki examined a decapod — a crustacean with ten legs — under the microscope.
生物課上，Yuki 在顯微鏡下觀察了一隻十足目動物——一種有十條腿的甲殼類動物。
combining form + noun (decapod = ten-legged creature)
Chinua trained for months to compete in the decathlon, a ten-event track and field competition, at nationals.
Chinua 為了參加全國錦標賽的十項全能——一項由十個田徑項目組成的比賽——訓練了好幾個月。
Elena studied the decasyllabic verse of Paradise Lost, noting how Milton built each line from exactly ten syllables.
Elena 研讀了《失樂園》的十音節詩行，注意到 Milton 讓每一行都由正好十個音節組成。
文法句型
deca- + noun (technical)
deca- + adjective (technical)
用法筆記
Distinguish from the metric-system sense (prefix/2) — this combining form builds whole words describing a quantity or structure of ten, not a multiplier before a measurement unit. The same word 'decapod' can belong to either category depending on context: in zoology (having ten legs) vs. metric (not used).