semidiameter

n. 半径

词形变化

semidiameters 复数 semidiameters

释义与例句

n.
  1. 1.

    The apparent radius of a star etc, when viewed from Earth.

    天文
  2. 2.

    A radius: half of a diameter.

    古体

词汇关系

名词

上位词 2

radius R

词源

From Middle English semidiametre, semydiametre, from Medieval Latin sēmidiameter, equivalent to semi- + diameter.

来源：wiktionary