### 資料來源 : Webster's Revised Unabridged Dictionary (1913)

Trigonometry \Trig`o*nom"e*try\, n.; pl. {-tries}. [Gr. ? a
triangle + -metry: cf. F. trigonom['e]trie. See {Trigon}.]
1. That branch of mathematics which treats of the relations
of the sides and angles of triangles, which the methods of
deducing from certain given parts other required parts,
and also of the general relations which exist between the
trigonometrical functions of arcs or angles.
2. A treatise in this science.
{Analytical trigonometry}, that branch of trigonometry which
treats of the relations and properties of the
trigonometrical functions.
{Plane trigonometry}, and {Spherical trigonometry}, those
branches of trigonometry in which its principles are
applied to plane triangles and spherical triangles
respectively.
Baptistery \Bap"tis*ter*y\,Baptistry \Bap"tis*try\, n.; pl.
{Baptisteries}, {-tries} (?). [L. baptisterium, Gr. ?: cf. F.
baptist[`e]re.] (Arch.)
(a) In early times, a separate building, usually
polygonal, used for baptismal services. Small churches
were often changed into baptisteries when larger
churches were built near.
(b) A part of a church containing a font and used for
baptismal services.