demilune
半月形堡壘
demi·lune /ˈdɛmɪˌlun/ 名詞
半月形的,半月體,新月細胞
Dem·i·lune n.
1. Fort. A work constructed beyond the main ditch of a fortress, and in front of the curtain between two bastions, intended to defend the curtain; a ravelin. See Ravelin.
2. Physiol. A crescentic mass of granular protoplasm present in the salivary glands.
Note: ☞ Each crescent is made of polyhedral cells which under some circumstances are supposed to give rise to new salivary cells.
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