/'mɔ:tə(r); `mɔrtɚ/
n [U] mixture of lime or cement, sand and water, used to hold bricks, stones, etc together in building 砂浆; 灰浆.

v [Tn] join (bricks, etc) with mortar 用砂浆砌合（砖等）.

/'mɔ:tə(r); `mɔrtɚ/
n
1 short cannon that fires shells at a high angle 迫击炮
*[attrib 作定语] under mortar fire/attack, ie being fired at by a mortar or mortars 在迫击炮火[攻击]之下.
2 strong bowl in which substances are crushed and ground with a pestle 臼; 研　. =>illus at pestle 见pestle插图.

n
[Date: 1000-1100; Language: Old French;Origin: mortier, from Latin mortarium]
[U]
a mixture of cement or lime, and sand and water, used in building for holding bricks or stones together
[C]
a heavy gun that fires bombs or shells in a high curve
　A cameraman was killed when his vehicle came under mortar fire .
　a mortar attack
pestle, mortar
[C]
a stone bowl in which substances are crushed with a pestle (=tool with a heavy round end)
　You'll need a pestle and mortar to grind the spices.
→bricks and mortaratbrick¹ (2)